Undo PokeCodec's PRs

This commit undoes most of PokeCodec's PRs after the debate in chat. Some
harmless or completely superseded PRs have been left alone, as there is not
much benefit in attempting to undo them.

Reverts #1104, #1108, #1115, #1118, #1119, #1124, #1126, #1127, #1132, #1136,
#1137, #1139, #1140, #1144, #1148, #1149, #1150, #1153, #1155, #1177, #1179,
#1180, #1181, #1182 and #1183.

include/pokenav.h

@@ -313,7 +313,7 @@ bool32 WaitForHelpBar(void);
 void sub_81C78A0(void);
 bool32 MainMenuLoopedTaskIsBusy(void);
 void sub_81C7FDC(void);
-void sub_81C79BC(const u16 *a0, const u16 *a1, int a2, int a3, int a4, u16 *palette);
+void sub_81C79BC(const u16 *a0, const u16 *a1, u32 a2, u32 a3, u32 a4, u16 *a5);
 void sub_81C7B40(void);
 struct Sprite *PauseSpinningPokenavSprite(void);
 void ResumeSpinningPokenavSprite(void);