UFO:Alien Invasion Code

* crushed png files

* Recompressed all textures in base/textures/tex_tech with Trimage image compressor and commited those files, where a filesize reduction of at least 5% (up to 43.2%) was achieved

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

* Renamed xerox_ -> copier_

* replaced textures with gpled version

* moved the last two remaining actions from texturebrowser view menu into the xml definition

* 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