PS3 Microphone array support

[marcel303]

Hi! I added a USB audio class driver implementation for the PS3 eye camera's microphone array. This allows one to record both video (using the existing video streaming code from PS3EYEDriver) and audio. It adds a new class, PS3EYEMic, which can be optionally used alongside PS3EYECam.

See the code in action here: https://youtu.be/o1iWJ17HWI8
The fifth, white, channel, is the average of the four microphone capsules. Just averaging them adds a nice noise filtering effect. :-)

Audio capture is performed for all four channels of the PS3 Eye, at 16kHz (the only sample rate it seems to support, despite marketing material advertising 48kHz.)

I also fixed a few issue in the existing PS3EYECam code, as it was stopping me from getting this to work (debayer fix, request free fix). The pull request includes these fixes.

Init:

	PS3EYEMic mic;
	MyAudioCallback audioCallback;
	
	if (eye != nullptr)
	{
		mic.init(eye->getDevice(), &audioCallback);
	}

MyAudioCallback:

	struct MyAudioCallback : AudioCallback
	{
		virtual void handleAudioData(const AudioFrame * frames, const int numFrames) override
		{
			// AudioFrame contains four int16_t's, one for each mic in the array.
			// Do something with this data here..
		}
	};

Regards,
Marcel Smit