TODO.txt

Long term goals:
  - implement a network game
  - rewrite XML loading
  - rewrite the engine to use only standard libraries and custom math
    helpers, so that the game backend is indepedent of Qt and potentially
    usable with other gui frameworks as well.
  - have the model loaded in GPU only once and let multiple instances
    of CBaseModel simply link to it.
  - implement a class to manage game's configuration
              
maths.h:
  - implement SMatrix4D and SQuaternion
             
CCreditsLabel.h:
  - this class is maybe unnecessary. Maybe setting and object name on the
    credits label object would suffice.

CSceneBrowser.h, CSelectionBox.h:
  - maybe merge these classes to one, or make CSelectionBox a base class for
    CSceneBrowser or something like that.
  
CScene.h, CScene.cpp:
  - move the XML loading code into a separate class named for example
    CFileLoader. The CFileLoader class could then load/save other file types
    like scene list or score list, too.
    CScene would only manage models, calculate intersection of mouse with model
    and shuffle textures of models.
  - the positions of elements in an XML file are assumed to be fixed - repair this
    
CPexesoScene.h, CPexesoScene.cpp:
  - rewrite findOptimalDistanceFromCamera()
  - maybe move zooming to trackball