Core: Add new system for parallelizing client packet processing. Handle WorldSession updates in Map::Update() where we are safe to proceed. Patch by Ambal.

(And clean up tabs and whitespace while rummaging around in there)
Closes issue 5084.

--HG--
branch : trunk

src/server/game/Chat/Channels/Channel.cpp

@@ -50,7 +50,7 @@ Channel::Channel(const std::string& name, uint32 channel_id, uint32 Team)
     {
         channel_id = 0;
         m_flags |= CHANNEL_FLAG_CUSTOM;
-        
+
         // If storing custom channels in the db is enabled either load or save the channel
         if (sWorld.getBoolConfig(CONFIG_PRESERVE_CUSTOM_CHANNELS))
         {