UFO:Alien Invasion Code

* Reduced filesizes of the tex_tech texture folder by compressing/optimizing the files with pngout

* Renamed xerox_ -> copier_

* Added xerox_b, xerox_c and xerox_d normalmaps, added xerox_d glowmap, updated LICENSES

* patch #2990890 (Weapons Glowmaps)

* Glowmaps for PBW weapons.