[WIP] build vortex for XBMC

Thats the first wip build of the vortex visualization in our repo. 
addons\visualization.vortex is just hacked together to test it running. It needs proper settings, icon, etc (@MartijnKaijser ?)
The presets and textures are taken from the xbmc4xbox repo as we don't have them in our repo.
The project file might need some cleaning too (@karlson2k ?)
Mr.C seems to provide some precompiled version in our forum. I dunno why he doesn't make it official and update our sources. This is my try to make the sources in our repo usable again.