Write Map Data Sets + Pause Screens

The map data sets can now be edited and written back to the ROM. For the background music this works just fine. By changing the song titles I could identify further maps of South Cape.

The ultimate aim is to make the maps visible in the editor.

As a little easier task in between I will try to make the pause screens editable. This shouldn't be a huge problem since all of the data lies uncompressed in the ROM. I played around with it a little by editing some values directly in the ROM: