Pop up menus

Frame: now shows a popup menu when a game is lost or won. This class now
holds the WordList object, which means the constructor has been changed
to take no arguments.
New method in the class to reset the panels (for a new round of the
game), and help methods for the reset method, are added.

Game: The WordList object is removed. This class might be unnecessary,
all it does is creates a new Frame.

LetterPanel: Added a method that resets the letterpanel for a new round
of the game.

WordList: Updated the default wordlist to not contain any å,ä,ö. Hehe.

Ps. Det kanske inte kompilerar, för jag har suttit och gjort allt direkt
i filerna på datorn, men det är lätt fixat imorgon när vi ses!