Changes "MacCoreaudio" audio system name into "Core Audio". Corrects wrong detection of input and output devices. Avoids concurrent process of the "stop" and "read/write" functions at the native level.

Adds stream capture and render via CoreAudio for MacOSX. This is a first version which needs more testing. The default audio system on MacOSX is still PortAudio.

Adds a way to retrieve the model identifier for audio devices: this allows an USB device without a serial number to be recognized as a single device regardless of the USB port used. MacOsX part only.