ReflectiveVertexlitSimple

Author: Eric Haines (Eric5h5)...not really, as this is mostly UT's code, but if you want to blame someone, that's me :)

Description
This is similar to the Reflective VertexLit shader, except it uses a slider to control amount of reflection, instead of using the alpha channel of the texture. Naturally this means it's far less flexible, but can be useful if you just want the entire texture to be reflective to some amount (and therefore uses a little less VRAM since you don't need an alpha channel). Basically this is a trivial modification of the built-in shader, with the Radeon 9000 code removed, as I have no idea how to write shaders for that kind of card. Hence it needs a SM 2.0 or later card to work.