FR: Subspace options

Many aspects of subspace missions are currently hardcoded, and it would be helpful to be able to control them via table.

Things I would like control over:

Number of layers present in the subspace model

Per layer:

-- Texture applied to the layer

-- Radial tiling factor, controlling how many times the texture is tiled around the circumference of the subspace tunnel (probably an integer)

-- Longitudinal tiling factor, controlling how many times the texture is tiled along the length of the subspace tunnel

-- Rotation speed, controlling the rate at which the texture rotates around the circumference of the tunnel

-- Translation speed, controlling the rate at which the texture translates along the length of the tunnel

Endcaps:

-- Ability to generate "sun" objects behaving like subspace endcaps, in arbitrary numbers and at arbitrary positions

-- Definable bitmaps for the suns, static or animated, with the possibility of using different bitmaps for different suns

-- Some way to make the sun bitmaps totally opaque