Release 0.5.2
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  * viewer: only show compatbile pixel format in selector
  * viewer: fix binning setting on some cameras
  * viewer: add a fallback to autovideosink if gtk[gl]sink are not available
  * viewer: fix video position issue
  * usb3vision: avoid unnecessary memory during video data transfer
  * usb3vision: better handling of device disconnection
  * gigevision: compile time selection of fast heartbeat mode (Michele)
  * camera: helper function for single image acquisition