Fix misc 8 (#1150)

* Use `s32` as type instead of `StackStatus` enum type

* `bossLimbDl` -> `bossLimbDL`

* Fixup comment refering to `Actor.velocity` by struct offset

* Fixup `feetFloorFlags` doc and -> `feetFloorFlag`

* Fixup `xyzDistToPlayerSq` comment

* Make `SkelAnime.mode` comment refer to `AnimationMode` (<- `AnimationModes`)

* Use enum names to refer to anim modes and break long lines in z64animation.h

* `EnDha_OverridePostDraw` -> `EnDha_PostLimbDraw`

* ichains cleanup

* Scene command ids usage cleanup

* Properly name unkXXX members as unk_XXX

* change `gSceneCmdHandlers` length in variables.h too

* Revert Unknown flags to unk0 & unk1

* Remove "current scene" mention from `Flags_*Unknown` as they aren't saved or loaded so not scene-specific

* `Struct_8011FAF0`: unk_00, unk_04

* Run formatter

* Do not break long lines in headers

* Revert "Fixup `feetFloorFlags` doc and -> `feetFloorFlag`"

This reverts commit c45b3611e7.

src/boot/stackcheck.c

@@ -72,7 +72,7 @@ void StackCheck_Cleanup(StackEntry* entry) {
     }
 }
 
-StackStatus StackCheck_GetState(StackEntry* entry) {
+s32 StackCheck_GetState(StackEntry* entry) {
     u32* last;
     u32 used;
     u32 free;