zxing-cpp: update to 1.3.0.

The major new features:

    Multi-barcode reading with the new std::vector<Result>
    ReadBardcodes(...) function. Does not work for Aztec, DataMatrix
    and Maxicode, yet.
    Multi-resolution scanning that can automatically downscale the
    input to substantially increase the detection rate on high
    resolution scans, see DecodeHints::tryDownscale, currently only
    enabled in the ReadBardcodes function
    New Result::symbologyIdentifier property (thanks to @gitlost)
    Updated and improved android wrapper (thanks to @markusfisch)

Worth mentioning:

    Most deprecated APIs from last release were removed (will likely
    break your build if you still have deprecation warnings with
    1.2.0)
    New Result::lineCount and DecodeHints::minLineCount properties
    to improve reliability of 1D code reading
    New Result::isMirrored property (works for QRCode, PDF417,
    DataMatrix)
    Improved FNC1 handling and deprecation of DecodeHints::assumeGS1
    Lots of small fixes all over the place
    Drop in-tree copy of stb image library
    New OpenCV example code
    QRCode reading improvements
    Python 3.10 support

(wiz)