Gradient Editor for Grasshopper 2

Trying to make a kick-ass gradient editor for GH2. Improvements over gradients in GH1 so far; more and better standard presets, panning and zooming (one dimensional), window selection for grips (with correct window/crossing testing for selection boxes drawn left-to-right or right-to-left), different display of continuous (round) vs. discontinuous (diamond) grips, more interpolation modes including 'cubic' and 'cubic cyclical' which can result in more natural overall gradients, number line display.

Many things still do not work at all or as well as they should, the previews in the preset menu should be bigger, the floating buttons don't support icons yet, there's no mechanism yet to add, remove or recolour grips.

I hope to also include a second type of gradient, one that is controlled via equations for rgba channels rather than a sequence of grips. I'd also like the add the ability to import/export common gradient file formats as well as exporting gradients to custom resolution images.