Refresh all of the ui files

* Resaved everything with Glade 3.38 which changes all of the properties from
using `_`'s to using `-`'s.
* Make sure everything has the license information, including the menu files
that Glade doesn't handle directly.
* Make sure that all of our ui files are requiring Gtk 3.22 as that is our
minimum and many of them were set to 3.20 which was making Glade angry.
* Change the margin-left to margin-start in xfer.ui

Glade is doing some weird stuff though that we'll need to watch in the future. Namely the format view isn't showing up as an internal client in `TalkatuEditor` for some reason and Glade removed the property from the Invisible `GtkTextTag`.

Testing Done:
Compiled and ran locally.

Reviewed at https://reviews.imfreedom.org/r/559/