Core/Spells: Cleanup in Spell.h:

- Codestyle (fix function naming) and cleanup changes in SpellCastTargets class, also access variables of this class by getters/setters
 - Move IsQuestTameSpell function to SpellMgr.h
 - Move UnitList typedef to Unit.h
Additionally - add missing copyright notice to SpellAuraEffects.h

src/server/scripts/EasternKingdoms/Deadmines/deadmines.cpp

@@ -47,8 +47,7 @@ public:
         }
         if (pInstance->GetData(EVENT_STATE)!= CANNON_NOT_USED)
             return false;
-        if (targets.getGOTarget() && targets.getGOTarget()->GetTypeId() == TYPEID_GAMEOBJECT &&
-           targets.getGOTarget()->GetEntry() == GO_DEFIAS_CANNON)
+        if (targets.GetGOTarget() && targets.GetGOTarget()->GetEntry() == GO_DEFIAS_CANNON)
         {
             pInstance->SetData(EVENT_STATE, CANNON_GUNPOWDER_USED);
         }