Entities should be deleted by the gamemap on client side instead of the render manager

- Entities should be deleted by the gamemap on client side instead of the render manager
- Creature reading/writing is the same as rooms/traps
- Small fix for creature sound
- Fixed a memory leak on Creature weapons
- Added a log for entity creation on client side as well as on server side
- Added [Creature][/Creature] in creature list in levels
fixes #247