Improved Device-In-Use Messages and Custom Constraints Logging

We improved the accuracy of the “The camera is already used by another app” and “The mic is already used by another app” messages in the recording client, so the correct one is now shown depending on whether the camera or the microphone is the device in use.

We also added clearer console logging when custom constraints are in use, including a warning when potentially disruptive constraints are set, to make troubleshooting easier.

Build slug: 21f8ce42c

NPM version: 2.0.4