Tomographical 1.1 - undo, sequence counter, and more

I've updated Tomographical with a few quality of life improvements:

• An undo button! With up to 20 levels of undo!
• A sequence counter! While you're dragging lines of tiles, you get a count of how many you've drawn so far - helpful for those long sequences.
• Play a 30x30 puzzle if you dare!
• Some miscellaneous bug fixes and visual improvements.

Have fun and stay sharp!