New method of copyToBuffer to grab all incoming data at once into token...

New method of copyToBuffer to grab all incoming data at once into token buffer. Pitch detection is performed in separate thread, launched in constructor, and probing for available data in the buffer.
In summary:
- input callback is less expensive, it just copies data
- transforming data to float is performed out of callback, in the thread
- no need to invoke thread every data incoming
- input forwarding seems to work even with PulseAudio
- buffer if bigger (16k), so chopping sound phenomenon disappeared