[jeyrb]

Closes #313.

LG webOS TV transport

• A webostv delivery is set up automatically with the LG webOS TV integration, with no YAML.
• Each TV's media_player entity is the target. The TV's legacy notify action, such as notify.living_room_tv, is found through its config entry, so a TV can be reached directly or by area, floor, label or device.
• TVs are only sent to when targeted, so they aren't interrupted by every notification.
• TVs that are off or unavailable are skipped, and that isn't counted as an error.
• Only the message is shown, and the title only when there's no message. data.icon is passed through.

Area, floor and label targets in delivery selection

Delivery selection now resolves area_id/floor_id/label_id when checking whether a delivery's target type is present. An area target therefore selects the transport that owns what's in it: webostv for a TV, and alexa_devices for an Echo. Before, only the catch-all notify_entity delivery picked up area targets. Two existing integration tests change only in the order of the same calls.

Skip reason fix

A reason a transport gives for sending nothing, such as NO_TARGET, is now kept instead of always being recorded as UNKNOWN. This also fixes Kodi and Discord.

Testing

• Unit tests and House integration tests, with each TV's area on its device as in a real install. All 2860 tests pass, with 97% coverage.
• Checked on the Docker preview Home Assistant with a stand-in TV: the delivery was created after a reload, an unavailable TV was skipped, and a TV that was on got one call with its message and icon.

Docs

• New transport page, plus updates to the targets table and the delivery selection docs.
• Roadmap note on dropping the transport if webostv moves to notify entities.
• Changelog.
• The "Target-Driven Implicit Selection" section of the roadmap still calls the check a cheap presence test, and may need updating.

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