[arch-dev-public] New core package: wpa_actiond

This is a small daemon that was originally part of autowifi. It will be a depend or optdepend on the next netcfg's auto-wireless mode. This will be a reliable wireless roaming mode. The daemon is somewhat similar to wpa_cli -a $script, but adds logging and avoids race conditions by adding a timeout on disconnection, an idea stolen from ifplugd. Is it okay to bring this to core? Dependencies are only glibc and wpa_supplicant, makedepends just gcc. Package is in testing for review.