UFO:Alien Invasion Code

* base/textures png crush.

* crushed png files

* Recompressed all textures in base/textures/tex_material with Trimage image compressor and commited those files, where a filesize reduction of at least 5% (up to 92.3%) was achieved

* Reduced filesize of the tex_material textures folder by compressing/optimizing the .png files with pngout

* GPL'd tex_material/metal001

* Normalmaps for some of my textures that were missing them.

* Some new textures for an electrical box

* Some new/updated textures

* New advert textures for city RMA