The player in Shotcut stops responding when a bluetooth headphone disconnects due to battery dying, stepping out of range, or simply turning it off

[shotcut]

This should be fixed by the fix for the related issue below since the detection and recourse are quite generic (reopen SDL audio if timed out waiting to receive callback). However, I have no way to check it (no windows device with bluetooth). You can test it in v18.09.

Changing the bit depth and sample rate in Windows renders the player unresponsive in v18.06.02 and later. v18.03.06 and earlier don't have this problem

Steps to reproduce: Launch Shotcut. Open a video with some audio or audio file. Sounds start to play. Let them play. Click Windows button in the taskbar, click Control Panel, and click Sound. In the Playback tab, click a audio device that is checked as default. Click Properties. The Properties dialog appears. Click the Advanced tab. In the Default Format area, choose a bit depth and sample rate that is different from the currently selected. Click OK. The player in Shotcut stops responding. Th…