Replaces the vendor-SDK-based vmbpy backend with Aravis, an open-source
GenICam/GigE Vision library that implements the network protocol itself,
so no Allied Vision account/license/SDK download is needed - just
PyGObject plus the system-packaged Aravis library. Renames
AlliedVisionVmbCamera -> AlliedVisionAravisCamera (and matching
file/sim/test names) to reflect the new backend; low-level Camera
wrapper keeps the same public interface, only its internals changed.
README rewritten with Aravis install steps and camera-ID discovery via
arv-tool-0.8 / Aravis.get_device_id().
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
