Provide a new variant, nano-full, that enables almost
all functionality of nano. Only libmagic file type detection
has been left out.

Ship with a minimal /etc/nanorc that the user can modify.
nanorc documentation at
https://www.nano-editor.org/dist/latest/nanorc.5.html

Provide color highlighting for the uci config files.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>
(cherry picked from commit 6a51794638)