Users can disable local beep

The transcription engine beeps when you start/stop transcribing so you know
that it's listening. Users can now disable this.

* add help text to all input fields in GUI
* make TaSTT generated file textctrls readonly, since I haven't tested
  them being reassigned
* document idea to configure unity & transcription apps with config files
* controller input thread no longer crashes if steamvr isn't running, it just
  slowly spins and waits
* when you stop transcribing, the transcription engine re-transcribes a few
  times. I think this should improve end-of-transcription tail latencies
* transcribe.py now prints out its args

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