Add support to add all device entities to Lovelace

[bramkragten]

If someone has a good idea where to place the button, please let me know :-)

Updated location:

Works the same as unused entities, except now with all entities of a device.

[SeanPM5]

Awesome feature!

I think the button might make a tiny bit more sense below the list of device entities. Current placement is asking the user to perform an action before they've even read the list of entities. They'd need to scroll down to read them and then back up to push the button.

Not a huge deal, but I think it feels a little more natural to have button beneath the list. Then by the time you read the list of entities you've already made an informed decision and can simply press the button if you want it.

[balloob]

Add it as an action to the card that lists the entities ? (So below like Sean suggested). Although addnig it as a link below the description on the left wouldn't be a bad idea either.

[bramkragten]

Did it as a card action :-)