UFO:Alien Invasion Code

* base/pics png crush.

* crushed png files

* Changed standard hud backgrounds to use partial transparency also

* Reduced filesize of the hud pictures folder by conversion of some of the .pngs to 4/8bit-16/256 indexed colors and compressing/optimizing the .png files with pngout afterwards

* add a big tooltip for soldiers on hud
** tooltip: head, tu, health, moral and weapon
** add function to request soldier info using prefixed cvar