SFR 444164 - AD sometimes crashes the Windows audio system
Close our audio devices when they are garbage collected in case we've leaked any connections to the audio system.
Note this combines with commit 3af30a0b7dd85b3ee79f53886cea272a68c3cdbf which is fixing a specific instance of not explicitly closing an audio device.

#FOR_CORE
Merge branch 'master' of github.com:Metaswitch/libjitsi