T1608 - Rhosydd VISS adaptation rework

Makefile.am

backends/mock/main.c

backends/mock/vehicle_attributes_spec.yaml

backends/speedo/speedo_attributes.json

backends/speedo/vehicle.c

backends/speedo/vehicle_builder.c

backends/speedo/vehicle_builder.h

clients/rhosydd-client.c

configure.ac

daemon/aggregate-vehicle.c

daemon/aggregate-zone.c

daemon/aggregate-zone.h

daemon/tests/aggregate-vehicle.c

debian/changelog

debian/control

debian/libcroesor-0-4.install

debian/libcroesor-0-5.install

debian/libcroesor-0-5.symbols

debian/librhosydd-0-4.install

debian/librhosydd-0-6.install