some tech come with a skin - but only 1 at a time
tech aperture - skin, damage cycles between -25% and +125%
tungsten carbide - skin, +100->150 max health
mass-energy equivalence - skin, gets a bit more benefit from defense
CPT symmetry - skin, costs a bit less energy
flip-flop, and relay switch and a few JUNK tech are also skins
some new images
bug fixes
