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Improve aesthetics and accessibility
Uses the 10 colors from this paper and adds some additional ones in order not to reduce the number of colors.
The default blue color for sent emails aligns well with the default blue accent color of Thunderbird.
These colors work well on both, light and dark backgrounds.
Also change highlight-color of current message (closes #37)
Comparison:
(In case you wonder why this looks slightly different from the colors above, see #53)