window: Complete moving enter/leave handling here
launcher: Remove the "VT-switched lock"

We'll replace it by pausing the Clutter master clock.
launcher: Pause Clutter during VT switches
launcher: Put in some markers to help diff make a readable patch
launcher: Replace mutter-launch with logind integration

This uses David Herrmann's new logind sessions interface to retrieve
fds for input devices, rather than using a custom setuid helper to do
the management. This vastly simplifies the interface.

This requires systemd v210, at least.

https://bugzilla.gnome.org/show_bug.cgi?id=724604
Revert "launcher: Put in some markers to help diff make a readable patch"

The markers have fulfilled their purpose.