Zigbee2MQTT Home Assistant add-ons.

This is a refactoring of https://github.com/zigbee2mqtt/hassio-zigbee2mqtt with the following (major) changes:

• Rewrite to use s6-overlay & co, and improve configuration handling
• ⚠️ BREAKING: Use addon_config mapping. See migration
  • Config folder is now included in Home Assistant add-on backups
  • Each add-on now has its own config folder (if wanting to switch between regular and edge add-ons, you must copy over the data)
  • The toggle to delete the add-on data when uninstalling the add-on will now remove your Zigbee2MQTT configuration (yaml, db, logs, etc.)
• All configuration.yaml settings are now handled either through the onboarding (can be forced in add-on configuration tab), the frontend once Zigbee2MQTT has started, or directly in the file itself (using add-on) while Zigbee2MQTT is stopped
• The Zigbee2MQTT watchdog is now enabled by default, with default settings
• For easier debugging (advanced), can now override app code through app_overrides folder in add-on config folder
  • On add-on start, if the app_overrides folder exists, its content is copied over the Zigbee2MQTT app folder (using exact folder structure)
  • Deleting the app_overrides folder will remove any override on next add-on start

For more details: https://www.home-assistant.io/common-tasks/os#installing-a-third-party-add-on-repository

If you are migrating an existing installation from https://github.com/zigbee2mqtt/hassio-zigbee2mqtt you will need to move your configuration.yaml (& logs if wanted). You can either do this with the config migrator add-on available in this repository, or manually (see below).

• Install the add-on, (check the add-on configuration page if anything needs changing for your setup)
• Install, start and open the Studio Code Server add-on from the add-on store
• In Menu > File > Add folder to workspace, select the addon_configs folder and add it
• After the interface is done reloading, you should then see both the /config and the /addon_configs folders
• If the appropriate *_zigbee2mqtt* folder does not exist, you must create it
  • You can get the exact name the folder should have by navigating to the add-on page and taking note of the URL:
    • Example URL: http://homeassistant.local:8123/hassio/addon/abcd1234_zigbee2mqtt/info
    • Example folder name: abcd1234_zigbee2mqtt
    • ⚠️ Be sure to take the right add-on if you have multiple Zigbee2MQTT installed
• Move the contents of the /config/zigbee2mqtt folder to the previously identified folder under /addon_configs
  • You should end up with something like this (uses example folder name from above):
    • addon_configs
      • abcd1234_zigbee2mqtt
        • log
        • configuration.yaml
        • coordinator_backup.json
        • database.db
        • database.db.backup
        • state.json
        • ...
• Update the settings on the new add-on configuration page as needed (e.g. socat)
• Start the new add-on