glsl-while

This adds the while loop to Godot Engine's simplified GLSL.

Notes

It's not a module; these files replace Godot's shader compiler and parser.
The shader editor recompiles GLSL shaders in real time, so typing an infinite loop, even temporarily as you write, would instantly freeze Godot. To prevent this, I added a few lines to the compiler that limit each while loop to 100 iterations. (You probably shouldn't loop that many times in a shader anyway, for performance reasons.)
There are no break or continue statements. Use if statements and variables instead if you need to stop the loop.