Teeworlds: Auto adaptable body markings

Right now we're using markings that are based on the default tee body shape, which on different body types might look weird and not that good.

My suggestion is to make the markings auto adapt to each different body type, by just using full image textures (no change in size or dimensions of the graphic files but just fill em up) and then make a function that automatically applies a mask on the desired body skin.

This would allow better and more good looking custom skins and real universal body markings.
A quick example, imagine that the squares are almost fully filled with cammo textures 😛