Fix high quality recorder

The current threading model was completely wrong.

A semaphore was used to lock the thread externally,
this should never be attempted, the correct way to block a thread is
to make it do nothing, in our case if we read 0 bytes from the
audio record

Also fix a potential deadlock in stopRecording by
waiting at most 1 second after stopping the thread

Change-Id: I61448185a8fee4287caf69f0c2a1d34b1517c367