Correct the Legal notice.
Rename all the classes that are not exported to application to 'Internal'
Turn the Rubik app into a MemoryTest.
Port changes from the 'distorted-cube' target.
Rubik App: minor
Rubk App: changes in the UI
Rubk App: add 4 buttons in the top.
RubikApp: simplifications.
Improve the architecture of the Rubik App: new RubikCube class.
1) new 'Rubik' app (skeleton)2) MeshCubes: add support for custom texture mappings on each side (Rubik needs that!)