Move connection dialog to settings, and allow user to connect vial notifier

[DaneGardner]

Move the connection widget from the dock bar to the settings manager. The user can select the default connection from there, and then can be asked if they wish to connect at the MainWindow notifier.

[DaneGardner]

Connection widget has been moved to settings manager, and the user is asked to connect via a popup dialog box. We'll need to move this to a window notifier later. Right now, we'd have to detect if there was a modal window currently open, which would prevent a user from selecting "yes" in the MainWindow::NotificationBar.