Core/Quests: Remove CastedCreatureOrGO method

- Remove EAI's ACTION_T_CAST_EVENT and ACTION_T_CAST_EVENT_ALL
- Remove SAI's SMART_ACTION_CALL_CASTEDCREATUREORGO
- Split QUEST_TRINITY_FLAGS_KILL_OR_CAST into QUEST_TRINITY_FLAGS_KILL and QUEST_TRINITY_FLAGS_CAST
- Assign QUEST_TRINITY_FLAGS_CAST to all the quests that were using RequiredSpellCastX
- (unrelated) Fix a warning in Player.cpp
- Replace CastedCreatureOrGO usage in scripts by KilledMonsterCredit

TODO: Convert the two EAI scripts commented out in the .sql to proper SAI

Closes #10667

src/server/game/Entities/GameObject/GameObject.cpp

@@ -1257,7 +1257,7 @@ void GameObject::Use(Unit* user)
                 if (Battleground* bg = player->GetBattleground())
                     bg->EventPlayerUsedGO(player, this);
 
-                player->CastedCreatureOrGO(info->entry, GetGUID(), 0);
+                player->KillCreditGO(info->entry, GetGUID());
             }
 
             if (uint32 trapEntry = info->goober.linkedTrapId)