Adds a showFeedback property to the QrReader #218
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When the `showFeedback` option is included in QrReader control, it will hilight the detected qr code in the video feed. This is accomplished by drawing a div over the top of the feed, which is positioned such that it approximately bounds the detected qr code.
Added an option to include some visual feedback for scanned qr codes.
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See issue #217
With this PR, the QrReader accepts a
showFeedbackproperty. When present, the control will display a green box around the detected QR code.