Regenerate color schemes using native KDE configurator and saner colors.

Solarized Dark:
- intense background is base02 "background highlights",
  not base01 "comments / secondary content"
- normal foreground is base0 "primary content",
  not base00
- swapped normal and intense of color 0 to match backgrounds

Solarized Light:
- deleted, will be regenerated
Remove Rakefile and add automatic installer.

Rakefile was broken (see previous commit). Too lazy to fix;
colors ain't going to change every day.

Moreover, generate "Light" colorscheme from "Dark" on install
by swapping monotone palette colors.