*** Sokoban game for LPC2104 Color LCD Game ***

Short description:
Sokoban (Japanese for "warehouse keeper") is a transport puzzle in which the player pushes boxes around a maze, viewed from above, and tries to put them in designated locations (target fields). Only one box may be pushed at a time, not two, and boxes cannot be pulled.

- the game has 20 levels (00-19) at the moment, additional levels can be added in sokoban_levels.h
- each level has 12 fields horizontally (XSIZE) and 11 fields vertically (YSIZE)
- by pressing the Center key during a game, the game can be paused and you have various options to continue: continue current level, restart current level, select another level (use right/left key to select level), terminate game
- status line: shows level (Lxx), playing time in minutes:seconds (Txx:xx), number of moves (Mxxx)
- the fields are shown as follows:
  border field: grey
  free field: yellow
  box: brown with a frame around a cross
  empty target field: red with a dashed frame around a cross
  box in a target field: red with a continuous frame around a cross
  player: the smart blue guy ;-) (yellow backgorund if player is on a free field, red background if player is in a target field)
