intuitive color-coding overhaul


It's not expected that you accept this (I don't really know python, and this is my first hack on this codebase), but thought you might like to know the ideas:
* color spectrum semi-evenly ranges in frequency & brightness (red/orange/yellow/green/blue/violet)
* each variable dynamically senses it's maxima (so it takes some fluctuations to stabilize)
* all values color-coded by percentage (0 = gray/unnoticable, maximum/100% = bright red)
* "idle" column has the reverse logic (100% = gray/unnoticable, 0% = bright red)