wg-quick conf file :: add include keyword

[Adrian Sevcenco]

Hi! Would be possible to add the include keyword?
something like :
include full_path_to_dir/*.conf
or
include dir/*.conf
where dir would be search for in the location of the configuration file.

This, together with a pair of systemd .path and .service
files would allow dynamical addition and removal of peers (and other 
settings)

Thank you!
Adrian