don't crash if there is no output
don't set _lastInputLoudness if input is muted
add the resample library to interface
Revert "add the resample library to interface"

This reverts commit 67d9bc0b14f31e924ffb884f319ff05441c8b46a.
Merge branch 'master' of github.com:worklist/hifi into qt-for-portaudio
initial work for change to 48KHz
change ring buffer to interleaved for stereo
remove a debug line
copy all passed samples to AudioRingBuffer
repair linear resampling for same number of channels
cleanup AudioRingBuffer API
changes for broken test
drive input from buffer callback and output from network
fix scope for input
fix scope for audio output
re-instate positional audio in the audio-mixer
repair upsampling and local loopback by correcting for limits
fixes for all current headsets work
fix the scope and last input loudness
fix last input loudness for mouth movement with no depth camera