Add graph-generation note to project.
Use java.awt.Color instead of re-implementing conversions.
Move layout tests into geometry ns to match source.
Implement color/blend and gradient.
Add single-argument grayscale rgb constructor.
Make grayscale color constructor a separate function.
Change gamepad test function to specify 'harness'.
Fix bugs in color/gradient function.
Change color/blend to blend-rgb and add blend-hsv function.