Core/RBAC: Create 'Skip instance required bosses check' permission

src/server/scripts/Northrend/IcecrownCitadel/instance_icecrown_citadel.cpp

@@ -954,7 +954,7 @@ class instance_icecrown_citadel : public InstanceMapScript
 
             bool CheckRequiredBosses(uint32 bossId, Player const* player = NULL) const
             {
-                if (player && AccountMgr::IsGMAccount(player->GetSession()->GetSecurity()))
+                if (player && player->GetSession()->HasPermission(RBAC_PERM_SKIP_CHECK_INSTANCE_REQUIRED_BOSSES))
                     return true;
 
                 switch (bossId)