Fix performance hit, clicking output with Linux PulseAudio (#180)

* Trying to fix PulseAudio awfulness - put Circle buffer back

* Writes to circle buffer.   Need to separate stream initialization now.

* Getting better!

Don't wait for operations in Start/Stop output function though - chain callbacks together

* Playback is smooth!  Delay in the UI though but maybe that's OK

* Source cleanup, remove useless mOutputIsRunning variable

* Include time.h to fix broken Linux build

* clean lint trap

* Weird that pthread is missing here

* Clean up logging, fix header file

* Drain, then cork PA in StopOutput.

* Apply clang-format

* GLARING error in StreamDrainedCB header

Don't write more than consumed from CircleBuffer
... cleanup some more junk

* Safe PA operation unreffing

* More cleanup and comments.

Works much better than before.  Probably not bug-free though.

* remove lint from belly button

* clear defs when DEBUG_SOUND is off

eliminate warnings and errorText variable