Overhaul the status box

* Subclass GtkBox instead of GtkContainer
* Remove message editing
* Use a GtkComboBox instead of our fake GtkComboBox
* Move to item id's rather than indexes
* Moved new status, and saved status to GActions
* Removed the account and token_account properties. we now show primitives and
saved status
* Removed the ability to delete saved status from the widget
* Use a widget template to construct the ui elements
* Removed the connection detection stuff

Testing Done:
Verified status were updated when used in the saved status manager.
Verified that the new status and saved status actions work.
Verified that the primitive status work.
Verified that the saved statuses work.

Bugs closed: PIDGIN-17591

Reviewed at https://reviews.imfreedom.org/r/1312/