Option menu, offer hardware fullscreen

[SimonN]

Version 0.2.19

Ramond can play with hardware fullscreen. The game didn't run on his laptop otherwise, neither in windowed mode nor in software fullscreen (= a window the size of the screen without a title bar). The command-line switch lix --hardfull=1600x900 accesses hardware fullscreen right now, where the resolution can be arbitrary.

This should get a nice user option, so Ramond doesn't have to run the game with command-line arguments all the time.