Map Editor

It's now possible to edit the maps in the editor just as I did in the following screenshot:

I still need to finish the compression routine to make it possible to write the edited map data back to the ROM.
I'm also working on the map palettes currently. A map consists of several palettes (up to 8). The palette which a single map tile uses is assigned by a 3 bit index that is part of the tileset data.
With this index I willtry to display the map with all the right palettes.