map: Maps are now 16x16 and have a tile size of 16x16

map: Maps are now 16x16 and have a tile size of 16x16

This mostly required reworking rendering as the actual game logic is
tile based anyway.

Drawing maps now happens in 2 steps.

Actors do not take into account the larger size yet. I will probably
switch to 8x16 objects eventually. This will however require a rework of
  the image converter