UFO:Alien Invasion Code

* Recompressed all textures in base/textures/tex_alienb with Trimage image compressor and commited those files, where a filesize reduction of at least 5% (up to 92.8%) was achieved

* Advanced repack of tex_alienb/ by pngout

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

* new alienbase textures (gpl 2 or later by Nate Wright)

* Adjustments to tex_material/metal012 and 013

* 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