Exherbo installs architecture dependent data in a different place than architecture
independent data. More concretely: binaries go in /usr/$chost/{bin,lib},
data goes in /usr/share and configs in /etc, /etc is already configurable
through CMAKE_INSTALL_FULL_SYSCONFDIR but the datadir was not. This
patch fixes it so that things can be pushed in the right places.
added new option of daemonize (-f --daemonize) that was added to swaylock in https://github.com/SirCmpwn/sway/pull/750 and added socket completion upon reading more into swaylock/main.c (it also is in the usage help but never had it in completion)
