This simplifies anything to do with the way policy rooms are watched.
There was a lot of weird glue code around finding policy rooms and
revisions that has just been whipped out into the WatchedPolicyRooms
abstraction.
This function now distinguishes between lists we are watching, lists
that are protected, and lists that we have parted from.
I don't like it. This should exist on the `PolicyRoomsManager` and
this is a complete and total mess. I don't know if there is time to
fix it yet.
* Stop using `setSerializedValue` on protection settings.
We don't need it now that we've updated the command reader.
* Update interface-manager and MPS.
* Enable standard presentation type translators.
This will fix issues with the ban command reason.