wormy 0.93.1304: circles, customisable controls

- update title picture to new name
- player keys can be entered from menu
- some bugs fixed like the one that stored names wrong
- game over screen looks better (less basic)
- levels can have *circles* in them!
  - wrote a nice routine from scratch (mostly on paper during vacation)
- default player names (Wormy, Viper, Nibbler, Spunky)