Enhanced Shaders D3 Q4 Prey

and Sikkpin new shaders ideas and implementations !Very latest features on shaders...:v2.6- Added and enhanced some features from latest Sikkpin awesome shaders mods !!!- Fixed a bug in the ambient-light.vfp shader and enhanced the detail.- Fixed lighting problems on Brilliant Highlights shaders.- Fixed some bugs and remove all TXB and use again TEX because is faster and also, like Parallax, is a feature we not need so much, so i can add other better things and improve on speed also, not only on quality !