zbar: allow to get binary QR codes

Kévin Commaille requested to merge zecakeh/gstreamer:zbar-binary into main

Added in zbar 0.23.1, the binary mode prevents zbar from trying to convert the binary data of QR codes to text by guessing the encoding.

This adds a property that changes the configuration of the zbar image scanner accordingly and allows to get the detected symbol as bytes with the barcode message.

My guess is that this would be released in GStreamer 1.24, hence the Since comments.

Edited by Kévin Commaille

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