Desura compatibilty

You currently can't install/start the Linux client on http://www.desura.com/games/openra To fix this we are currently unpublished by DesuraNET staff. I already tweaked the install settings and prepared a patch for OpenRA. I do the MCF generation from a fresh install of an RPM from `/usr/share/openra` for Linux and NSIS Setup.exe from `Program Files/OpenRA` for Windows. Left some documentation on https://github.com/lodle/Desurium/wiki/Notes-For-Publishing-On-Desura because it is quirky.