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.
(cherry picked from commit 954e2f32b09d4cd821264e496d6e3a1677d20df8)

Conflicts:
	src/org/jitsi/impl/neomedia/device/DeviceSystem.java
Corrects deadloack between the CoreAudio AudioDeviceStop function and the stream processing callback.
(cherry picked from commit 272b4e576f50cea4aeeb00c02fd69d8c1ad0b246)
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.

Conflicts:
	src/org/jitsi/impl/neomedia/device/Devices.java
Mac Core Audio: Stops the rendering process at most after 500 ms even if there is more data already buffered.
Corrects deadlock when closing renderer in Core Audio. Reports c error to java logger.
Merge CoreAudio in to master