We must wait for camerabin2's stop-capture procedures to finish before quitting
the main loop or firing off the next capture. If we get stuck waiting for
camerabin2 to become idle, this is a bug that needs fixing.
Adds gst-camerabin2-test example application, similar to
gst-camerabin-test for camerabin.
It is useful for taking pictures and recording videos using
camerabin2 and providing arguments for most of camerabin2
properties