Simple palettes + outlines

Fixed (manually selected) palette at the moment; closest colour picking
is done in RGB space (not perceptually uniform).
Outline done using normal vectors (normals perpendicular to eye vector
are on an edge), finally mathematically correct. This doesn't produce
the desired result, so I'll change my approach or do heavy tweaking.
Added a nice colourful texture (sampled from my desktop background).
My model conversion code was a bit off, so I'm using an existing tool
for now.