Core Cleanup Part 2: Cleaning up some methods so they are more easier to id for people that don't understand the terms listed in the core.

What methods have been renamed:

*RS is now RealmServer
*WC is now WorldCluster
*WS is now WorldServer

and many others. These settings have been tested and working well.

More updates are coming soon.

Part 3 will be method naming and iding them. Going the way of doxygen, Documentation and HACKS in the core. Each line will have a info line, telling what it does and the functions it uses. This will be more easier on developers, instead of trying to guess what functions do what.