Specifically, this commit removes the add action from the contact-view
and replaces it with a listener within contact-hook for additions
to groups. This means that when a ship is added to a group that the
contact-hook is watching, the ship is automatically sent an invite to
join that "managed group" from the contacts application. This also
includes the UI integration work on the management screen and settings
screen for working with the new group / permission structure.
Instead of providing a (unit path), allows for (list path), which better
supports the "update to path and subpath cases".
For example, if /things wants updates about everything, and
/things/specific wants updates about the specific thing, they'll both
need to receive a %fact when the specific thing changes.
Previously, these would have been two separate moves. Now, gall handles
the multi-targeting for you.
