Add Pokemon Crystal as a sixth supported version

Crystal boots from a user-supplied ROM, imports a full cache and is playable:
copyright, the Crystal intro movie, the animated title, gender select, Oak,
and out into Johto. 122 of the cart's 169 script specials are implemented.

Import and data
- tools/make_crystal_manifest.py derives the manifest by importing
  make_gold_manifest as a library, with three additive keyword seams. Gold and
  Silver still regenerate byte-identical, which is the standing requirement for
  touching that generator.
- crystal_symbol_deltas.py and crystal_movie_symbols.py carry the symbol delta:
  Crystal renames the credits mons, splits the trainer card, Pokegear and
  pack-pal blocks by gender, and replaces the intro and title outright.
- Crystal-only manifest keys: engineFlagOrder (162 flags to Gold's 93, so the
  badge block sits one higher) and unownCharmap (the main charmap parser stops
  at the first newcharmap so the two cannot contaminate each other).

Extractor
- RomExtractorGen2 becomes three-edition. Crystal corrections: PAL_MAP_BANK
  0x13, a flat PICS_FIX pic bank, audio bank 0x5e, the mapSongs id-100 hole,
  seven NPC trades, a TradeTexts stride of 8, the five Crystal tileset anim
  steps with per-row degrade, and the column-major trainer card portraits.
- New: animated front sprites (frames, bitmasks, play and idle scripts), the
  Battle Tower roster, Kris assets, Mobile System GB art, and the Crystal
  intro and title via src/import/CrystalMovie.lua.

Engine
- GameVersion gains engine(id) and fixes(id). Gold and Silver keep their
  original bugs where the bug is not hardware dependent; Crystal gets the fixes
  Crystal shipped: Lucky Number boxes 10-14, surfing onto an NPC, and the
  Reflect and Light Screen defence overflow.
- Crystal story: Suicune and Eusine, Celebi behind the GS Ball flag, the Ruins
  of Alph chambers, Buena, the Move Tutor, the Poke Seer, and the Battle Tower
  including the wInBattleTowerBattle badge-boost guard.
- Kris and the gender flag, animated fronts in battle and the summary screen,
  and mon caught data.

Verification
- Every extracted asset is pixel-compared against pret's own source PNGs.
- Gold caches are byte-identical before and after, file for file.
- New Crystal suites plus a T2 Gen 2 tier; the full suite passes.

src/script/gen2/Opcodes.lua

@@ -173,6 +173,113 @@ local Opcodes = {
   [0xa1] = { name = "warpfacing", size = 5 },
 }
 
+-- pokegold/macros/scripts/events.asm:1015 DEF NUM_EVENT_COMMANDS EQU $a2
+Opcodes.NUM_EVENT_COMMANDS = 0xa2
+
+-- pokecrystal/macros/scripts/events.asm:1-539 is identical to pokegold's, so
+-- $00..$51 is copied; :541 inserts farjumptext and shifts everything after it.
+local CRYSTAL = {}
+for byte = 0x00, 0x51 do
+  local row = Opcodes[byte]
+  CRYSTAL[byte] = { name = row.name, size = row.size }
+end
+
+-- pokecrystal/macros/scripts/events.asm:541-1066, cross-checked against
+-- ScriptCommandTable at pokecrystal/engine/overworld/scripting.asm:64-237.
+CRYSTAL[0x52] = { name = "farjumptext", size = 3 }
+CRYSTAL[0x53] = { name = "jumptext", size = 2 }
+CRYSTAL[0x54] = { name = "waitbutton", size = 0 }
+CRYSTAL[0x55] = { name = "promptbutton", size = 0 }
+CRYSTAL[0x56] = { name = "pokepic", size = 1 }
+CRYSTAL[0x57] = { name = "closepokepic", size = 0 }
+CRYSTAL[0x58] = { name = "_2dmenu", size = 0 }
+CRYSTAL[0x59] = { name = "verticalmenu", size = 0 }
+CRYSTAL[0x5a] = { name = "loadpikachudata", size = 0 }
+CRYSTAL[0x5b] = { name = "randomwildmon", size = 0 }
+CRYSTAL[0x5c] = { name = "loadtemptrainer", size = 0 }
+CRYSTAL[0x5d] = { name = "loadwildmon", size = 2 }
+CRYSTAL[0x5e] = { name = "loadtrainer", size = 2 }
+CRYSTAL[0x5f] = { name = "startbattle", size = 0 }
+CRYSTAL[0x60] = { name = "reloadmapafterbattle", size = 0 }
+CRYSTAL[0x61] = { name = "catchtutorial", size = 1 }
+CRYSTAL[0x62] = { name = "trainertext", size = 1 }
+CRYSTAL[0x63] = { name = "trainerflagaction", size = 1 }
+CRYSTAL[0x64] = { name = "winlosstext", size = 4 }
+CRYSTAL[0x65] = { name = "scripttalkafter", size = 0 }
+CRYSTAL[0x66] = { name = "endifjustbattled", size = 0 }
+CRYSTAL[0x67] = { name = "checkjustbattled", size = 0 }
+CRYSTAL[0x68] = { name = "setlasttalked", size = 1 }
+CRYSTAL[0x69] = { name = "applymovement", size = 3 }
+CRYSTAL[0x6a] = { name = "applymovementlasttalked", size = 2 }
+CRYSTAL[0x6b] = { name = "faceplayer", size = 0 }
+CRYSTAL[0x6c] = { name = "faceobject", size = 2 }
+CRYSTAL[0x6d] = { name = "variablesprite", size = 2 }
+CRYSTAL[0x6e] = { name = "disappear", size = 1 }
+CRYSTAL[0x6f] = { name = "appear", size = 1 }
+CRYSTAL[0x70] = { name = "follow", size = 2 }
+CRYSTAL[0x71] = { name = "stopfollow", size = 0 }
+CRYSTAL[0x72] = { name = "moveobject", size = 3 }
+CRYSTAL[0x73] = { name = "writeobjectxy", size = 1 }
+CRYSTAL[0x74] = { name = "loademote", size = 1 }
+CRYSTAL[0x75] = { name = "showemote", size = 3 }
+CRYSTAL[0x76] = { name = "turnobject", size = 2 }
+CRYSTAL[0x77] = { name = "follownotexact", size = 2 }
+CRYSTAL[0x78] = { name = "earthquake", size = 1 }
+CRYSTAL[0x79] = { name = "changemapblocks", size = 3 }
+CRYSTAL[0x7a] = { name = "changeblock", size = 3 }
+CRYSTAL[0x7b] = { name = "reloadmap", size = 0 }
+CRYSTAL[0x7c] = { name = "refreshmap", size = 0 }
+CRYSTAL[0x7d] = { name = "writecmdqueue", size = 2 }
+CRYSTAL[0x7e] = { name = "delcmdqueue", size = 1 }
+CRYSTAL[0x7f] = { name = "playmusic", size = 2 }
+CRYSTAL[0x80] = { name = "encountermusic", size = 0 }
+CRYSTAL[0x81] = { name = "musicfadeout", size = 3 }
+CRYSTAL[0x82] = { name = "playmapmusic", size = 0 }
+CRYSTAL[0x83] = { name = "dontrestartmapmusic", size = 0 }
+CRYSTAL[0x84] = { name = "cry", size = 2 }
+CRYSTAL[0x85] = { name = "playsound", size = 2 }
+CRYSTAL[0x86] = { name = "waitsfx", size = 0 }
+CRYSTAL[0x87] = { name = "warpsound", size = 0 }
+CRYSTAL[0x88] = { name = "specialsound", size = 0 }
+CRYSTAL[0x89] = { name = "autoinput", size = 3 }
+CRYSTAL[0x8a] = { name = "newloadmap", size = 1 }
+CRYSTAL[0x8b] = { name = "pause", size = 1 }
+CRYSTAL[0x8c] = { name = "deactivatefacing", size = 1 }
+CRYSTAL[0x8d] = { name = "sdefer", size = 2 }
+CRYSTAL[0x8e] = { name = "warpcheck", size = 0 }
+CRYSTAL[0x8f] = { name = "stopandsjump", size = 2 }
+CRYSTAL[0x90] = { name = "endcallback", size = 0 }
+CRYSTAL[0x91] = { name = "end", size = 0 }
+CRYSTAL[0x92] = { name = "reloadend", size = 1 }
+CRYSTAL[0x93] = { name = "endall", size = 0 }
+CRYSTAL[0x94] = { name = "pokemart", size = 3 }
+CRYSTAL[0x95] = { name = "elevator", size = 2 }
+CRYSTAL[0x96] = { name = "trade", size = 1 }
+CRYSTAL[0x97] = { name = "askforphonenumber", size = 1 }
+CRYSTAL[0x98] = { name = "phonecall", size = 2 }
+CRYSTAL[0x99] = { name = "hangup", size = 0 }
+CRYSTAL[0x9a] = { name = "describedecoration", size = 1 }
+CRYSTAL[0x9b] = { name = "fruittree", size = 1 }
+CRYSTAL[0x9c] = { name = "specialphonecall", size = 2 }
+CRYSTAL[0x9d] = { name = "checkphonecall", size = 0 }
+CRYSTAL[0x9e] = { name = "verbosegiveitem", size = 2 }
+CRYSTAL[0x9f] = { name = "verbosegiveitemvar", size = 2 }
+-- events.asm:1003-1008: Crystal's swarm is `db flag` then `map_id`, not a bare
+-- map_id; Script_swarm makes three GetScriptByte calls (scripting.asm:654-662).
+CRYSTAL[0xa0] = { name = "swarm", size = 3 }
+CRYSTAL[0xa1] = { name = "halloffame", size = 0 }
+CRYSTAL[0xa2] = { name = "credits", size = 0 }
+CRYSTAL[0xa3] = { name = "warpfacing", size = 5 }
+CRYSTAL[0xa4] = { name = "battletowertext", size = 1 }
+CRYSTAL[0xa5] = { name = "getlandmarkname", size = 2 }
+CRYSTAL[0xa6] = { name = "gettrainerclassname", size = 2 }
+CRYSTAL[0xa7] = { name = "getname", size = 3 }
+CRYSTAL[0xa8] = { name = "wait", size = 1 }
+CRYSTAL[0xa9] = { name = "checksave", size = 0 }
+
+-- pokecrystal/macros/scripts/events.asm:1068 DEF NUM_EVENT_COMMANDS EQU $aa
+CRYSTAL.NUM_EVENT_COMMANDS = 0xaa
+
 -- Commands that end the current linear path (jumps transfer control).
 --
 -- `fruittree` and `describedecoration` are ScriptJumps (Script_fruittree does
@@ -185,9 +292,13 @@ local Opcodes = {
 -- these four regardless.  `catchtutorial` is deliberately NOT here: it ends on
 -- `jp Script_reloadmap` and the script really does continue afterwards, the
 -- same way `reloadmap` itself does.
+--
+-- `farjumptext` is Crystal-only and joins them for the same reason `jumptext`
+-- is here: pokecrystal/engine/overworld/scripting.asm:318-327 ends on
+-- `jp ScriptJump` into JumpTextScript.
 Opcodes.TERMINATORS = {
   sjump = true, farsjump = true, memjump = true, jumpstd = true,
-  jumptext = true, jumptextfaceplayer = true,
+  jumptext = true, farjumptext = true, jumptextfaceplayer = true,
   stopandsjump = true, ["end"] = true, endall = true, endcallback = true,
   reloadend = true,
   fruittree = true, describedecoration = true,
@@ -198,10 +309,12 @@ Opcodes.TERMINATORS = {
 -- behind it.  Every row above is keyed by the opcode byte the cart carries, and
 -- src/import/RomExtractorGen2.lua resolves a command as Opcodes[byte]: a byte
 -- that is not in that table breaks the pointer walk into an `unknown` row.  Give
--- a mod verb one of the free bytes ($a2..$ff) and ROM data that happens to start
--- with it would decode as a mod call instead of ending the walk, so the free
--- space stays free and the extension op is reachable only by NAME -- which is to
--- say, only from a row a mod wrote, never from one the extractor did.
+-- a mod verb one of the free bytes and ROM data that happens to start with it
+-- would decode as a mod call instead of ending the walk, so the free space stays
+-- free and the extension op is reachable only by NAME -- which is to say, only
+-- from a row a mod wrote, never from one the extractor did.  The free space is
+-- per dialect and the intersection is what matters: Gold leaves $a2..$ff
+-- (events.asm:1015), Crystal only $aa..$ff (events.asm:1068).
 --
 -- src/script/gen2/Vm.lua:runModCommand is the only reader; the contract for the
 -- row shapes and the verb table is documented there.
@@ -211,4 +324,15 @@ function Opcodes.key(bank, address)
   return string.format("%02x:%04x", bank, address)
 end
 
+CRYSTAL.TERMINATORS = Opcodes.TERMINATORS
+CRYSTAL.MOD_COMMAND = Opcodes.MOD_COMMAND
+CRYSTAL.key = Opcodes.key
+
+-- Gold and Silver share one dialect (pokegold/macros/scripts/events.asm:540);
+-- Crystal renumbers from $52 (pokecrystal/macros/scripts/events.asm:541).
+function Opcodes.forEdition(edition)
+  if edition == "crystal" then return CRYSTAL end
+  return Opcodes
+end
+
 return Opcodes