Create new textures for the building tarmacs

Pretty much this. The nomads dont really have a good one right now, and instead they should have something similar to the other factions (not uef) where they place a decal around the ground which looks like a foundation, and added texture magic to boot.

This is also a design task where design suggestions are welcome!

there are two kinds of texture:
1. the tarmac itself which is currently a hexagon texture
2. decals on the ground which are placed according to building size or type - these are separate images that are faction specific

The decals should be a little generic so that they can be reused for buildings of the same size

would be good to first create a mockup texture to get the sizes roughly right and then get a final specification out.