• ci: use Github actions for linux and macOS (Emmanuel)
• ci: minGW support (Václav)
• gigevision: use proper broadcast addresses during discovery (Václav)
• camera: accessor to float feature increment (Emmanuel)
• camera: make set_trigger more robust (Emmanuel)
• camera: fallback to Continuous mode if SingleFrame is not available
  (Emmanuel)
• viewer: allow to save a snapshot as png or jpeg image (Emmanuel)
• viewer: display all pixel formats in selector (Emmanuel)
• simulator: now works on Windows and macOS (Václav, Emmanuel)
• debug: fix output on Windows (Václav)
• doc: Windows build documentation (Václav)
• tests: new arv-test application for automated testing (Emmanuel)