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harmless or completely superseded PRs have been left alone, as there is not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/battle_util.h

@@ -41,19 +41,6 @@
 #define WEATHER_HAS_EFFECT ((!ABILITY_ON_FIELD(ABILITY_CLOUD_NINE) && !ABILITY_ON_FIELD(ABILITY_AIR_LOCK)))
 #define WEATHER_HAS_EFFECT2 ((!ABILITY_ON_FIELD2(ABILITY_CLOUD_NINE) && !ABILITY_ON_FIELD2(ABILITY_AIR_LOCK)))
 
-void HandleAction_UseMove(void);
-void HandleAction_Switch(void);
-void HandleAction_UseItem(void);
-void HandleAction_Run(void);
-void HandleAction_WatchesCarefully(void);
-void HandleAction_SafariZoneBallThrow(void);
-void HandleAction_ThrowPokeblock(void);
-void HandleAction_GoNear(void);
-void HandleAction_SafariZoneRun(void);
-void HandleAction_WallyBallThrow(void);
-void HandleAction_TryFinish(void);
-void HandleAction_NothingIsFainted(void);
-void HandleAction_ActionFinished(void);
 u8 GetBattlerForBattleScript(u8 caseId);
 void PressurePPLose(u8 target, u8 attacker, u16 move);
 void PressurePPLoseOnUsingPerishSong(u8 attacker);