* Register devices into the registry
* Switch to device ID instead of webhook ID
* Rearchitect mobile_app to support config entries
* Kill DATA_REGISTRATIONS by migrating registrations into config entries
* Fix tests
* Improve how we get the config_entry_id
* Remove single_instance_allowed
* Simplify setup_registration
* Move webhook registering functions into __init__.py since they are only ever used once
* Kill get_registration websocket command
* Support description_placeholders in async_abort
* Add link to mobile_app implementing apps in abort dialog
* Store config entry and device registry entry in hass.data instead of looking it up
* Add testing to ensure that the config entry is created at registration
* Fix busted async_abort test
* Remove unnecessary check for entry is None
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