Aravis 0.8.11

• stream: add an extensible info API (Emmanuel)
• gvstream: improve packet resend request behaviour in case of unordered gvsp
  packets (Emmanuel)
• gvstream: wait for thread setup during ArvGvStream initialization (Emmanuel)
• gigevision: use MAC as serial number fallback (Emmanuel)
• genicam: fix arv_exposure_mode_to_string (Martin)
• usb3vision: improve error reporting in case of libsub error (Emmanuel)
• usb3vision: automatically detach kernel driver (Emmanuel)
• cameratest: add a test duration parameter (Emmanuel)
• misc: rename internal ArvStatistic to ArvHistogram (Emmanuel)