Convert Indigo Shaders from GLSL to Ultraviolet

[davesmith00000]

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[davesmith00000]

Ah yeah, the build is going to fail until I publish Ultraviolet.

Chicken and egg, I need to do enough of this work to prove UV is ready for release. Works just fine locally.

[davesmith00000]

Ported ImageEffects, once again, worked first time...

[davesmith00000]

Quick update:
There are only three 'library' shaders left to port: ShapeBox, ShapeCircle, and ShapePolygon.

After that, a decision needs to be made about the 'base' template shaders, and if (:crossed_fingers:) they are/can be replaced, then the GLSL lang validator and all the shader code gen can also be removed.

[davesmith00000]

I think this is ready, but I need to cut a release of Ultraviolet to prove it works...

[davesmith00000]

The build is green!

...but I've thought of more things to do:

1. The standard shaders are still using the old GLSL bases.
2. The new UV shader bases still contain the lighting stuff... but that isn't used.