[Merge] lp:~phablet-team/qtubuntu-camera/fix-trust-prompt-bugs into lp:qtubuntu-camera/stable

[Florian Boucault]

The proposal to merge lp:~phablet-team/qtubuntu-camera/fix-trust-prompt-bugs into lp:qtubuntu-camera/stable has been updated.

Description changed to:

Refactor media recorder code to:
- ensure proper cleanups
- prevent double start/stop of recordings
- allow for soundless recordings
- do not start recording before microphone access is allowed/forbidden by user

Fixes:
Bug #1487126: Camera/mic trust: initial video corrupt
Bug #1487131: Camera/mic trust: mic denial in camera-app freezes camera
Bug #1487159: revoking mic permission in system-settings, camera appears to record but video is unplayable	

For more details, see:
https://code.launchpad.net/~phablet-team/qtubuntu-camera/fix-trust-prompt-bugs/+merge/268776
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