* 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
* git-renamed pc_d.jpg (file without license) -> pc_d.png, replaced pc_d.png with new, selfmade version, added pc_d_gm.png