Some notes in quaternions (moved from demo file); polished up some notes in choices scene, fixed text string jumping around; removed test code from Hilbert mixer; renamed curves.GetLength() to GaussLegendre(), added Romberg() integration (all results are VERY close now), also teased out the polynomial stuff into separate steps (still might try to add some magic for the cubics); using Romberg integrator for Catmull-Rom case in pixels demo; brought in color picker