[FEATURE] Update database on signal from ExtensionManager

The extension manager emits a signal that allows the same modifications
to the database definition as the install tool. This patch subscribes to
the signal and sends the SQL fragment for the smartobjects to the
extension manager.

Change-Id: Ibffc0bc16d6a6ad057c34a345b80f8b416095410
Resolves: #60581
Reviewed-on: http://review.typo3.org/31872
Reviewed-by: Tim Lochmüller <tim@fruit-lab.de>
Tested-by: Tim Lochmüller <tim@fruit-lab.de>