Firey Balls of Fire mod - Replacement for "bloomed" suns. 4.0

* Updated the shader to use the new star colours added in 0.18.

Fix for the 0.172 update.

Update 19/06/2014:
* Removed annoying oval shape when star reaches screen borders.
* Star is now less transparent when reaching screen borders.
* Stars colour warps less when reaching screen borders.
* Removed need to manually input screen resolution!
* Star now emits more light (without being blinding).
* Did a lot of optimizing, shader now seems to run faster than the default. (It does for me, but I'd love some more confirmation).