Cleanup the Desura crap

I did it wrong. The current setup will loop pre-launch wrapper scripts indefinitely instead of starting the game. However the editor will work because I gladly chose a different filename not understanding how the auto-generation from wildcards work. Those ugly shell-scripts are also dynamically generated by the Desura client so I updated https://github.com/lodle/Desurium/wiki/Notes-For-Publishing-On-Desura#linux accordingly with my new trial and error findings. A little help from http://www.desura.com/support would have been appreciated, but I only got `dunno about Linux` back. :anger: