* added reading/writing working version of new model format V3
* added CStaticObject with minial interface intended for
non-interactive static objects like trees
* converted first model, tree0, to new format
* refactored model loading code based on code from dev-models
* support new model format V2 (without LOD levels)
* removed LOD levels support in CEngine and from model files
* preparations for new model format V3:
- support for multiple meshes in one model file
- support for saving crash spheres and shadow spots
- removed all direct dependencies on CEngine enum values
- quantized model rendering states to new flags and enums
* remove unused functions and members
* make protected functions used only locally or in factory
* rename some functions to be more meaningful
* refactor some enums to enum classes
* move functions creating objects to new class CObjectFactory
* replace calls to CObject::Create*() with CObjectManager::Create()
* move creation/deletion of some objects to better places
* make CModelManager non-singleton
* clean up some code in changed functions
* Moved path management from CApplication to CPathManager
* Moved %lvl% replacements from CParserParam to CPathManager
* Added %lvl% support in produce(), closes#426
* created a static library containing most source modules
to avoid compiling source modules twice in code and unit tests
* moved profile_test to main unit tests executable
* removed image_test and edit_test as not really useful
* 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
* localename library is now used to determine the actual locale used
* added patched version of FindGettext.cmake to fix
installation path of translation files
Piotr Dziwinski