Magic Cube

Convert the theme to be a MaterialTheme and the TransparentImageButton to be a MaterialButton - the first forced by the second, and the second because a MaterialButton gives us control over the location of the icon in top of it. We need that because of the new 'solve/scramble' split-button in the lower right of the Play screen.

Fix the solver (after rearranging the faces of the cuboids)

Fix problems with TwistyObjectNode 'object scale' property.
Now this property is not part of the Node at all, but its initial value passed to the object in its constructor.

Bugfixes for crashes from Firebase.

Bugfix.

Add 7x7 tutorials.

Tutorials for the 6x6

Move the main app to the 'J1M1' object creation mode, i.e. create them from the Json files and using the Dmesh fiels as well.

Make it possible for any app descending from the 'objectlib' to use any of the J0M0, J0M1, J1M0, J1M1 modes.

Remove ObjectType from a few moree places.

Remove dependancies on Firebase from objectlib.
Report such errors to the application via the Interface.