Code style cleanup and small fixes, up to CreatureDefinition.cpp,h

 - Added missing copyright headers
 - applied the code convention, mostly respecting 4 spaces as indentation.
 - Made sure members were initialized
 - Added m in front of members, eg: mSpeed.
 - Grouped functions together when they were mixed with members.

Also removed an unused variable in Creature.cpp I overlooked earlier on MSVC.