bugfixes
progress with PlayActivity - colors of the level buttons.
Remove all old UI 1.0 classes
Progress with the generic PlayActivity.
Progress with PlayActivity
Progress with tutorials.
minor
remove 'MESH_NICE'
Initial support for the new Pattern Dialog.
Version 2.0: add Solver Activity.
Major progress with version 2.0.0.
Major progress to version 2.0.0.