Add themes (or palette/scheme pairs as they're referred to elsewhere)
commonly found and used in other terminals:
* Tango Palette (Dark and Light themes)
* XTerm Palette (Dark and Light themes)
* Rxvt Palette (Dark and Light themes)
* Solarized Palette (Dark and Light themes)
* Linux Console Palette & Theme
Signed-off-by: Mohammad AlSaleh <CE.Mohammad.AlSaleh@gmail.com>
* Add a color deriver and derive dim colors for all themes.
* Derive actual bright colors for the OneHalfDark theme while at it.
* Use dim colors when the DIM flag is set.
Signed-off-by: Mohammad AlSaleh <CE.Mohammad.AlSaleh@gmail.com>