improved runtime parameters for spiral and radial

RadialGradient should be redundant with SpiralGradient at this point. (A
spiral with angle-hue-width of 0 yields a radial gradient.)
twinkle fade out/in seemed to be backwards

also adjusted colors
Merge branch 'master' of https://github.com/craftyjon/firemix
we want to see output from compile-ui

hiding this output /closing the window tends to be less than helpful
fancier gradient presets...

spiralgradient has pinwheel wave function
radialgradient has concentric wave function
simplex and radial gradients have some luminance parameters
merge from master?