Bump to version 0.22
    
    The main focus of this version is to make zbarcam-qt a
    full-featured application, allowing to use all ZBar library
    features with a GUI interface.
    
    It also comes with an optional new feature to allow inverting
    the colors when parsing images. That's specially useful for
    QR codes, as it seems that several such barcodes come inverted.
    
    There are also some bug fixes on it.
    
    Sumary of changes:
    
      * zbarcam-qt: allow changing resolutions in real time
      * zbarcam-qt: better support ZBar options
      * zbarcam-qt: do several visual improvements
      * zbarcam-qt: make it remember the geometry
      * zbarcam-qt: allow show/hide control and options bars
      * zbarcam-qt: remember lastly used settings and camera controls
      * zbarcam-qt: allow changing ZBar decode options via GUI
      * Add API to allow get/set resolutions
      * img_scanner: add handler for color-inverted codes
      * img_scanner: fix get_config parameter validation
      * scan_video: improve logic to remove duplicated/invalid devnodes
      * symbol.c: fix symbol hash logic (prevents crash with QR options)
      * configure.ac: fix an error at libv4l2 package check
      * fix some typos
      * exit gracefully when decoding split QR codes
    
    Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>