d/jak2: decompile ambient | speech and bigmap-data (#1954)

fma-sphere not completed due to #1888

decompiler/config/jak2/stack_structures.jsonc

@@ -999,6 +999,19 @@
   "(method 17 sky-work)": [
     [16, "vector"]
   ],
-  // placeholder
-  "placeholder-do-not-add-below": []
+  "(method 18 drawable-region-face)": [
+    [16, "vector"],
+    [32, "vector"]
+  ],
+  // stack casts can't be guessed in a "run in process" (since the arg numbers are shifted?)
+  "lightning-start": [
+    [16, "vector"],
+    [32, "vector"]
+  ],
+  "lightning-trail-fractal-gen": [
+    [16, "vector"],
+    [32, "vector"],
+    [48, "vector"],
+    [64, "vector"]
+  ]
 }