Lots of polishing:
+ Added an applet
+ Added winning, fixed a lot of things related to game over
+ Added proper player sprites
+ Added utility method to draw strings with borders
+ Added about and How to play stages
* Fixed how the game was started, since it made no sense at all
* Made enemies quite a lot faster
* Updated to Aritzh 1.1.8
* Moved Button to the gui package
* Fixed showing tiles getting flagged
* Changed name to UnderMine (next commit will be changing packages and folder names)