Parse radial gradient center-position.
Add support for circular gradients, prepare shaders to allow setting center.
Add simple radial gradient support, fix lint warnings.
Add support for colour stops, equally spaced. 10 stops should be generous!
Add angular linear gradient support!
Add basic support for linear gradients!
Build texturing infrastructure & implement background-color!
Improve debuggability, correct rect shrinking.
Add test script!
Draft background-colour shader.