UFO:Alien Invasion Code

* base/textures png crush.

* 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

* Last low-res textures replaced for alien base.

* Lots of work on alien base power core, new textures, etc.

* Hi-res textures for alien base WIP with new map and mat files

* WIP alien base and some texture changes

* GPL'd and unified tex_buildings/wall027-032

* GPL'd tex_buildings/wall027