fix(gobject): elevator bug + prevent bugs related to faction and flags (#1402)

- Closes #1396

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

@@ -1890,7 +1890,7 @@ void GameObject::CastSpell(Unit* target, uint32 spellId)
     else
     {
         // xinef: set faction of gameobject, if no faction - assume hostile
-        trigger->setFaction(GetGOInfo()->faction ? GetGOInfo()->faction : 14);
+        trigger->setFaction(GetTemplateAddon() && GetTemplateAddon()->faction ? GetTemplateAddon()->faction : 14);
         // Set owner guid for target if no owner availble - needed by trigger auras
         // - trigger gets despawned and there's no caster avalible (see AuraEffect::TriggerSpell())
         // xinef: set proper orientation, fixes cast against stealthed targets

src/server/game/Entities/GameObject/GameObject.h

@@ -32,8 +32,6 @@ struct GameObjectTemplate
     std::string IconName;
     std::string castBarCaption;
     std::string unk1;
-    uint32  faction;
-    uint32  flags;
     float   size;
     union                                                   // different GO types have different data field
     {