Game/Scripting: Add OnGameEvent hook for game objects.

Called when specific game event starts

src/server/game/Scripting/ScriptMgr.cpp

@@ -1510,6 +1510,11 @@ InstanceScript* ScriptMgr::CreateInstanceData(InstanceMap* map)
     return tmpscript->GetInstanceScript(map);
 }
 
+void ScriptMgr::OnGameEvent(bool start, uint16 eventId)
+{
+    FOREACH_SCRIPT(GameObjectScript)->OnGameEvent(start, eventId);
+}
+
 bool ScriptMgr::OnDummyEffect(Unit* caster, uint32 spellId, SpellEffIndex effIndex, Item* target)
 {
     ASSERT(caster);