This is a massive refactoring because it collects all the renderops
of all renderpasses into one long array in the Render object.
Lots of code in there is still flaky and needs cleanup. That will
follow in further commits.
Other than that it does work fine though.
All the ops that just execute a shader do pretty much the same stuff, so
put it all in a single function that they all call.
It's basically faking a base class for them.
This shader is an updated version of the mask shader, but I want to use
the mask name for the mask node and that's a different functionality.
Also, add an operation for it and partially implement the mask node
using it, so we can test that this shader works.
Replacing the shader used for text rendering is the next step.
