write new shader for nomads warp in effect

supcom uses shaders using hlsl.

nomads needs a new effect for units warping in - the unit starts completely transparent, and then phases into view from front to back over a period of time.

this can be done by modifying the current nomads build shader and using the progess value (which can be set manually) to phase in the unit. there should be effects in the shader along the edge of the transition, with before being invisible and after looking like a normal unit.