Partially revert terminal and root support

This partially reverts commits fec26e9b1870e92 and
827829642b12fcb. Doing things in the theme was a bad idea if used
together with emacs daemon, as the theme is loaded once for the server.

Now I declare root faces, to be set on file loading. Explicitly setting
fonts for 16 color ttys remains to be done. It seems the only way is
duplicate all font declarations, or rely on emacs choices.