* removed -mod argument
* removed -datadir argument
* removed -lang argument
* removed some dead ui code
* added resource manager and file loaders (stream and SDL)
* changed interface textures location to match new directory structure
* removed CGameData for mod support
* added PhysFS support
* added logging of application events
* changed debug mode flag to independent debug modes
* added option to auto-start mission (load a mission immediately
after startup)
* removed "enum value out of range" prints
* some refactoring
* removed classes managed by CInstanceManager
except for CObject, CPyro, CBrain and CPhysics
because of dependencies
* refactored instance searching to use existing singleton instances of
CApplication, CEngine and CRobotMain and calling their getter
functions
- new class CModelManager
- rewritten engine object structure in CEngine
- created shared model data instead of separate objects per each
model instance
- minor refactoring