major restructuring of rendering path.
more abstraction for scene rendering.
more math functions on points, vectors
adding very simple GL and Raytracing renderers.
slight change to scene rendering, plus simpler z buffer depth for rt.
use colortables (more) properly in scene renderers.
flesh out simple gl renderer.
re-enabling 1D plot support.
adding 1d plot bar plot styles.
enabling logarithmic again.