fix(colors): stabilize colors

[imsnif]

This includes various fixes to the new coloring system:

1. Support 8bit terminals - this is done by having the default palette being 8bit
2. Do not crash on boxes without an x11 system (this was unfortunately done by removing the automatic xrdb reading - we can find a way to re-add it later)
3. Fix the colors in the interface (the colors of some elements were wrong)
4. Fix the interface breaking in smaller sizes (the lengths and coloring of the more/less messages in the tabs and the single-letter ctrl shortcuts on the status bar were wrong and made them seem broken).