Powerview migrate scene to string unique_id (#128131)

homeassistant/components/hunterdouglas_powerview/__init__.py

...sistant/components/hunterdouglas_powerview/config_flow.py

homeassistant/components/hunterdouglas_powerview/cover.py

homeassistant/components/hunterdouglas_powerview/entity.py

tests/components/hunterdouglas_powerview/conftest.py

tests/components/hunterdouglas_powerview/const.py

...mponents/hunterdouglas_powerview/fixtures/gen1/rooms.json

...ponents/hunterdouglas_powerview/fixtures/gen1/scenes.json

...ponents/hunterdouglas_powerview/fixtures/gen1/shades.json

...nents/hunterdouglas_powerview/fixtures/gen1/userdata.json

tests/components/hunterdouglas_powerview/test_config_flow.py