Finish up the fluid mapper implementation for VTK

Lots of minor changes to fit VTK style and testing.

fixed an opengl issue where the fluidnormal texture
was being queried before being activated.

Changed the particle colors to use the pointdata scalars
instead of a second input.

Improve the CPU performance of the demo by reducing some
computations that were not needed.

Spelling fixes, switch to srgba colorspace

add in environment mapping when IBL is On

fix normal computation to use camera matrix

Removed some of the last remaining hardcoded depths in the
shaders. Moved the demo to a different file to make the test
a bit easier to read.