Improve Colours

Colouring could be greatly improved in many cases:

Currently, the 256-color heatmap colors do not progress clearly from least-used to most-used lines (brightness and saturation varies too much and unpredictably between levels), and some colors should be re-chosen
in both 256-color and "true-color" modes, the lines which get the most execution are currently closest in color to unexecuted lines. It may make more sense to reverse this pattern, so that most-executed lines get brighter reds, and least executed lines get paler colors. Alternately, it might be best to increase the brightness and saturation executed lines.
the frontend currently simply assumes that users are employing a "dark" schemed terminal with a background somewhere near #202020 or so. It should be changed either so that output colorization is customizable, having dark, light, (or even no-color options) (which could be selected either by passing an argument or reading a config file), or so that all output is given a (forced) dark background to ensure readability across different terminal color schemes (easier fix, but far more jarring and inelegant).

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