Dimmable light buttons

[Keplernl]

Describe the new functionality

Using a slider to also be able to dim lights. This can be done using the same style using the Lovelace Light button, or with a longpress opening a slider

What will it look like in the Admin area?

Automatically added if the light supports dimming?

What will it look like on the dashboard?

My suggestion would be to look like the lovelace light: https://www.home-assistant.io/images/lovelace/lovelace_light_card.png

How will it work for standalone users vs. Hass.io Addon users?

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