Aravis 0.8.32

• viewer: workaround for Blackfly Mono16 pixel endianness issue (@berke)
• gst: disconnect camera in stop method #907 (@EmmanuelP)
• gst: stream object accessor (@kohtala)
• gst: camera change signal (@kohtala)
• gst: stream change signal (@kohtala)
• gst: allow software trigger (@WhaSukGO)
• gvsp: fix chunk detection (@feuerste)
• gv_device: crach fix on finalization (@feuerste)
• Fix device_write_memory rust binding (@freeman94)
• introspection: add generic feature value accessors (@kohtala)
• chore: fix libxml2 deprecation warnings(@EmmanuelP)
• chore: appstream fixes (@cmarmo)