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

* Adding crate textures and prefabs to be used in alien base (also a couple updates on .map and .mat)

* Work on the parking garage sign for +city RMA. Trying out normalmapping,specular mapping, glowmapping.

* Some new textures for an electrical box

* Some new/updated textures

* New advert textures for city RMA