UFO:Alien Invasion Code

* base/textures png crush.

* 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

* updated texture by nerf5000 from the texture thread http://ufoai.ninex.info/forum/index.php?topic=5301.msg42572#msg42572

* replaced with gpled texture by nerf5000 from the texture replacement thread at http://ufoai.ninex.info/forum/index.php?topic=5301.msg42563#msg42563