RubikApp: properly compute cameraDistance and FOV.
RubikApp: minor
RubikApp: make the rotations smooth.
RubikApp: simplifications.
Improve the architecture of the Rubik App.
Improve the architecture of the Rubik App: new RubikCube class.
Improve the Rubik App - rotation works now.
Improve the Rubik App - beginnings of rotation.
Improve the Rubik App.
Finish the Rubik app.
Improvements for the 'Rubik' app.
1) new 'Rubik' app (skeleton)2) MeshCubes: add support for custom texture mappings on each side (Rubik needs that!)