Magic Cube

Do not block the UI if, for some reason, some of the effects failed to get added to the Queue. Just fail to rotate.

Make per-component centers optional, controlled by API MeshBase.setUseCenters()

Bugfixes as a result of the Samsung Galaxy J4+ investigation:

1) By default, switch off transform feedback in the main program.
Create a new API 'needTransformFeedback()' to call if someone still needs TF in the main program.
2) lower the default max number of vertex effects to 30....

Samsung Galaxy J4+ investigation.

Disallow setting a name with spaces in it.

Improve the way we scramble the Kilo and Megaminx.

Up version to 1.6.4

Megaminx - tutorials.

Megaminx mesh.

Progress with Megaminx - icons.