GUI Improvements (Build 1.4.31)

This new build has quite a few minor GUI improvements:

• When open a puzzle pack ("Easy Does It", "Piece of Cake", etc.) it'll take you to the first unsolved puzzle in the pack.

• Level numbers are now shown along with the puzzle names.

• Once completely solving all the puzzles in a pack it'll let you know instead of just moving on to the next puzzle pack.

• Added a Locked button that'll toggle showing which parts are locked. This was already in the using the "L" key, but now there is button.

• Right clicking on a part in the part bin will bring up the help window for it.

• You can now quit from the settings window.

• A few other changes here and there to make GUI flow a little smoother

That's it for now. Back to work for me.