Core/Spells: rework part 4: iterate over effects first

Implement far spell queue processing

# Conflicts:
#	src/server/game/Spells/Spell.cpp

src/server/game/Maps/Map.cpp

@@ -3448,8 +3448,22 @@ bool Map::IsSpawnGroupActive(uint32 groupId) const
     return (_toggledSpawnGroupIds.find(groupId) != _toggledSpawnGroupIds.end()) != !(data->flags & SPAWNGROUP_FLAG_MANUAL_SPAWN);
 }
 
+void Map::AddFarSpellCallback(FarSpellCallback&& callback)
+{
+    _farSpellCallbacks.Enqueue(new FarSpellCallback(std::move(callback)));
+}
+
 void Map::DelayedUpdate(uint32 t_diff)
 {
+    {
+        FarSpellCallback* callback;
+        while (_farSpellCallbacks.Dequeue(callback))
+        {
+            (*callback)(this);
+            delete callback;
+        }
+    }
+
     RemoveAllObjectsInRemoveList();
 
     // Don't unload grids if it's battleground, since we may have manually added GOs, creatures, those doesn't load from DB at grid re-load !