Changed clear button to be an icon, added a keyboard shortcut (default Z).
Reinstate old "rotate" mode into mode sequence.
Added option to turn on/off using "free rotate" mode by default. Links to starting mode for a board, if this option is off, 2D boards use "twist", cylinders and 3D boards with bases use "rotate", other shapes use "free rotate".
Fixed issue with the show board controller setting.
Added a continue last game option to Wordsearch game.