Map Display Improvement

I improved the display of the maps by considering the tileset offset bit which is part of the tileset data. This bit signals which part of a large tileset (Size = 0x4000 Bytes instead of 0x2000 Bytes) is to be used for a specific tile.
As a result, some maps look much better now, some of them can be seen in the following screenshots with a comparison of the old and new look.

Edward's Castle Old:

Edward's Castle New:

Inca Ship Old:

Inca Ship New: