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For convenience

This makes it easier for plugins to detect the nickname

Previously we called the disconnect handler only when a plugin was deactivated.

We have to preserve it until the file transfer is finished

- nbxmpp supports no HTTP Upload
- Remove support for previous HTTP Upload versions

- Refactor File class to a more generic FileTransfer class

- FileTransfer class holds the transfer state and notifies other objects via signals

- Refactor File object
- Make some methods/vars private

When a contact accepts our subscription request issue a system
notification instead of a InformationDialog

This shortens status messages correctly if there is more than one resource.
Additionally, this always adds a new line for status messages to keep the
tooltip's width small.

Applies ellipsizing on strings for name, jid, and status messages.
Overly long group chat topics will be shortened as well.

Fixes #9926

If any error happens while creating the Gstreamer pipeline and elements,
guard against them being None.

This allows us to update certain actions, e.g. when no account is connected

Add option to exclude Local account from the result

Use disable_account() before removing

On closing a control this checks if logs are enabled for the contact/account
and displays the appropriate message.

Adapt to nbxmpp changes

See https://blogs.gnome.org/hughsie/2013/10/01/copyright-in-appdata-files/ for details.