wobbly-otter-002
Updating StreamPanel to use cairo to render a default background should
the stream not be playing. It will also serve to relay the overall status
of the stream to the user with an icon. Status messages such as configuring,
misconfiguration, crashed, and recording should display at the center of
the background. Previewing the stream will remain the same as before, but
will need to be implemented through cairo instead of GtkImage.