- class CGuiHandler is now called GameEngine to better describe its
functionality
- renamed global GH to more clear ENGINE
- GH/ENGINE is now unique_ptr to make construction / deconstruction
order more clear and to allow interface / implementation split
- CGuiHandler.cpp/h is now called GameEngine.cpp/h and located in root
directory of client dir
- All XXXplayers are now in client/media directory
- Reogranized code on one class per file basis
- Extracted interfaces from handlers. Handlers now implement
corresponding interface.
- CCS now only stores pointer to an interface