Magic Cube

Remove the last 'isSolved()' (from Dino4) and put it to the parent class as a special case.

Standarize the 'isSolved()' method: now all objects, except one (Dino4) have a standard isSolved().
This incidentally also fixes detection of the solved state in case of Diamond4, i.e. a Master FTO.

Come back to creating the objects from mesh.

Add flag of Madagascar.

Make the 3x3 and 4x4 Diamond meshes smaller.

Finally remove cubit creation from the implementation classes and move it to the TwistyObject.

Convert the last object, Skewb Ultimate, to the new scheme.

Convert the two Squares to the new scheme.

Convert Skewb to the new scheme. New smaller mesh for the Master Skewb.

Convert Rex Cube to the new scheme.