UFO:Alien Invasion Code

* crushed png files

* Recompressed all textures in base/textures/tex_shop with Trimage image compressor and commited those files, where a filesize reduction of at least 5% (up to 46.6%) was achieved

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

* Replaced all existing fruit textures & normalmaps with quadrupled texture resolution versions (fruit001-fruit005)
* git-renamed fruits006_new_lq-fruits010_new_lq + normalmaps to fruits006-fruits010
* Replaced all fruit textures on all maps with new versions
* Added more variety by also using fruits006-fruits010 on all maps
* git-deleted unnecessary textures fruits001_lq-fruits005_lq & their normalmaps
* Minor other fixes on maps
* Updated LICENSES

* Renamed all fruit* jpg textures to png & replaced them with new, selfmade png versions without artifacts
* Added normalmaps for all of those fruit* textures
* Added versions with quadruple resolutions for all of the existing fruit textures for future replacement on maps, added fruits006_new_lq.png & normalmap