Core/Spells: ported implementations of SPELL_AURA_DISABLE_CASTING_EXCEPT_ABILITIES and SPELL_AURA_DISABLE_ATTACKING_EXCEPT_ABILITIES from master branch

closes #93

src/server/game/Entities/Unit/Unit.cpp

@@ -5588,6 +5588,9 @@ bool Unit::Attack(Unit* victim, bool meleeAttack)
     if (creature && creature->IsInEvadeMode())
         return false;
 
+    if (HasAuraType(SPELL_AURA_DISABLE_ATTACKING_EXCEPT_ABILITIES))
+        return false;
+
     // nobody can attack GM in GM-mode
     if (victim->GetTypeId() == TYPEID_PLAYER)
     {