Remove QTKit for Xcode 8 / macOS 10.12 Sierra#31

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jdonald wants to merge 19 commits intoclementfarabet:masterfrom

jdonald:fix-avfoundation

Commits on May 29, 2017

Large-scale s/QT/AV/
James Donald
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Comment out 11 sections causing errors/warnings
James Donald
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Commits on May 30, 2017

Fix (NSArray *)videoDevices
James Donald
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Fix (AVCaptureDevice *)defaultVideoDevice
James Donald
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Fix initWithDevice because it takes another arg now
James Donald
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Move error capture from addInput to initWithDevice
James Donald
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The open() error check is handled creating AVCaptureDeviceInput
James Donald
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Use a dispatch queue and specify <AVCaptureVideoDataOutputSampleBufferDelegate>
James Donald
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Add two delegates for captureOutput and use CMSampleBufferGetImageBuffer
James Donald
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Only kCVPixelBufferPixelFormatTypeKey is supported
James Donald
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Looks like not much error checking for AVCaptureVideoDataOutput
James Donald
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Less strange indentation
James Donald
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Try to match the old spacing style
James Donald
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Add missing call to addOutput
James Donald
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Commits on Jun 6, 2017

Use camopencv or cammacos, but not both
James Donald
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Send OpenCV_FOUND up to parent scope
James Donald
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Use the single-camera code
James Donald
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Fix multi-camera interface to grab from index idx
James Donald
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Don't hardcode nChannels, fixes colorization
James Donald
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