Core/Creature: update creature_template and some other small things

http://www.trinitycore.org/f/topic/9572-creature-damage/

src/server/game/Spells/Spell.cpp

@@ -5088,7 +5088,7 @@ SpellCastResult Spell::CheckCast(bool strict)
                     return SPELL_FAILED_TARGET_UNSKINNABLE;
 
                 Creature* creature = m_targets.GetUnitTarget()->ToCreature();
-                if (creature->GetCreatureType() != CREATURE_TYPE_CRITTER && !creature->loot.isLooted())
+                if (!creature->IsCritter() && !creature->loot.isLooted())
                     return SPELL_FAILED_TARGET_NOT_LOOTED;
 
                 uint32 skill = creature->GetCreatureTemplate()->GetRequiredLootSkill();