r1022: Restructure overlay and label code for efficiency; change the graphic display somewhat
Restructure overlay and label drawing code to push more drawing code into
the waveform and vectorscope components. Precompute the overlay geometry
when the window is resized rather than every time it's drawn.
Change graduation lines from bright green to dim gray. I thought the bright
green distracted from the more important data.
Added 7.5% SMPTE luminance line on waveform.
Insure label values are multiple of 10 (9's were due to floating point
truncation).
Centered label text in column. Looks a little nicer, I think.
Position vectorscope label values more closely to the vectorscope circle
instead of with the waveform display.
Draw color axes on vectorscope and label the axes with R,G,B,C,Y,M.
Patch by Craig Lawson.