Update #12 - new main menu and UX improvements

This week patch brings in a new menu flow and some visual improvements. Also lots of background changes for future patches.

Changes

• Dioramas are now organized into collections.

• Game now has a Main Menu, currently used for collection picking.

• Rows that have a voxel removed or marked will now be marked as modified. Hints on those lines will have a different color.

• Minor performance improvements.

• Fixes for UI issues when using touchscreen.