account: Fix property name Spaces are not valid characters in property names, and never were. Until recently GLib silently fixed up the name by replacing the space with '-', but now tightened up the validation.
Add a systemd user service corresponding to the D-Bus session service
This lets Mission Control run in its own cgroup.
As a bonus, systemd activation doesn't have to resort to hacks like mc-wait-for-name, because systemd understands the concept of a systemd service that maps to multiple D-Bus service names, and will only start it once.
