New package: CopyAgent-1.47.0410

It's mostly a port of this PKGBUILD: https://aur.archlinux.org/packages/co/copy-agent/PKGBUILD

The only thing I didn't include was the per-user systemd services that the other person wrote. The allow_unknown_shlibs=yes variable is to ignore the fact that some of the libraries that the nautilus and caja extensions reference are internal libraries.

I'm also considering splitting the console client from the GUI client, but I'm not absolutely sure that that splitting's warranted yet.
makedepends -> depends

There's no need to use makedepends in this package, because it only provides some binaries.