- provide map data with multi-line attribute
- map width/height must match exactly with provided data
- the set map width/height will be the playable field (not like in C&C
  where 1 invisible border is taken from width/height, resulting in a
  width-2 and height-2 playfield).
- getCell turned into 4 liner (instead of 20+ liner). Does not cerr
  warnings.