Sorry for the long absence of new informations but I've been very busy the last few weeks...
But nevertheless I found some time to work on the editor anyway ;)
The main task for me at the moment is the completion of the compression routine for the map arrangement and tileset data.
I already made a decent progress with it since the algorithm does in roughly 95% of the compression workflow what is it supposed to do. So now I need to find out what goes wrong in the remaining 5%.
When I finish the algorithm there will be many many new things to show here ;)