[ ] Tiles that are flagged as exit have all the rest of their flags point into the exit table
[ ] Exits may be locked
[ ] Doors may be opened and can unveil more of the map
-[ ] Implement partial map redraws. Allow queueing up a map redraw which then is processed over several frames.
+[ ] Implement partial map redraws. Allow queueing up a map redraw which then is processed over several frames. Allow setting a start address, tiles per row and rows to redraw.
## Units