Pokemon Silver as a full launcher version, plus launcher mods-list and title-tempo fixes

Silver: derived import manifest (tools/make_silver_manifest.py re-resolves
the Gold manifest's symbols from pokesilver.sym), silver GameVersion row,
generation-keyed extractor routing, required-files override, edition save
stamping (a Silver playthrough no longer writes into the Gold save),
checkver-driven edition data, SILVER/KAMON/OSCAR/MAX presets, GOLD rival
default, edition credits banner, Lugia title screen (OAM layouts, bob,
trail, palettes as title.lua data keys with Gold defaults so old caches
need no re-import), packaging for every build target, docs, and tests.

Launcher: the installed-mods list is one continuous scroll (rows culled to
the viewport) instead of a pager with an inner scroll viewport; the pad
cursor's edge-scroll no longer runs it to the bottom. The game dropdown
shows just the initial and caret. Find-tab behavior unchanged.

Title tempo: a sprite-anim frame shows duration+1 ticks
(engine/sprite_anims/core.asm GetSpriteAnimFrame), which locks both
editions' 64-tick wing beat to the 64-tick sine bob; the title screens no
longer run fast and out of phase.

src/ui/TouchControlsEditor.lua

@@ -73,7 +73,10 @@ function Editor.load(opts)
   }
   local optsTbl = SaveData.loadOptions()
   local applied = optsTbl
-  if opts.version == "gold" then
+  local GameVersion = require("src.core.GameVersion")
+  local gen2 = GameVersion.VERSIONS[opts.version]
+    and GameVersion.generation(opts.version) == 2
+  if gen2 then
     local gold = type(optsTbl.gold) == "table" and optsTbl.gold or {}
     applied = {
       touchControls = gold.touchControls,
@@ -151,7 +154,9 @@ local function persist()
     skin = cfg.skin,
     layouts = cfg.layouts,
   }
-  if Editor.version == "gold" then
+  local GameVersion = require("src.core.GameVersion")
+  if GameVersion.VERSIONS[Editor.version]
+      and GameVersion.generation(Editor.version) == 2 then
     opts.gold = type(opts.gold) == "table" and opts.gold or {}
     opts.gold.touchControls = block
   else
@@ -569,7 +574,7 @@ function Editor.new(game)
   local state = { game = game, isOpaque = true }
   Editor.hostPoll = true
   Editor.load({
-    version = "gold",
+    version = require("src.core.GameVersion").get(),
     hostPoll = true,
     onClose = function()
       Editor.hostPoll = false