qcam: main_window: Introduce initial hotplug support

Hook up various QCam UI bits with hotplug support introduced
in previous commits. This looks good-enough as first steps
to see how the hotplugging functionality is turning out to be
from application point-of-view.

One can still think of few edge case nuances not yet covered
under this implementation especially around having only one
camera in the system and hotplugging/hot-unplugging it.
Hence, those are intentionally kept out of scope for now. It
might require some thinking on how to handle it on application
level having additional time on hand.

Signed-off-by: Umang Jain <email@uajain.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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