Enigma Source (svn, archived)

- renaming to st_rotator, st_rotator_cw, st_rotator_ccw
- state as rotation direction
- attribute "movable" instead of stone variation
- improved light behaviour:
- every light addition causes change
- light changes on moves and swap are fully respected
- fixed strange impulsing behaviour that could cause stones
to be pushed several grids at once or two rotators to move together
- fixed all swap problems concerning light and crashed due to impulses