Magic Cube

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....

Megaminx - tutorials.

Rename 'Minx' to 'Kilominx' - there would be a separate 'Kilominx' and 'Megaminx' series.

Minor.

We now have much more effects possible, 100 by default - it is no longer needed to call setMax().

Kilominx: tutorials

Rex Cube Mesh

Make the Tutorial Dialog look better

Remove the Taiwanese tutorials for now.

Put new things to the StackFrame.