Webcam capture sometimes hangs application during re-initialization

[acmertz]

Instant re-initialization of the camera (such as when rotating to a different camera or toggling between the capture preview and the import dialog) sometimes causes the camera API to die, which results in Ensemble of One hanging indefinitely. Once this state is entered, there is no known fix short of quitting and re-launching Ensemble of One. This may be fixed by adding an artificially-extended delay in the camera initialization chain, to ensure that the camera system has a few more moments to stabilize before being activated.