Support the visual editor

[j9brown]

Is your feature request related to a problem? Please describe.

I have hundreds of lines of YAML for my decluttering templates and they're difficult to edit that way.

Describe the solution you'd like

I want to use the visual editor to create and use decluttering templates.

Additional context

I have implemented the visual editors and some other new features in my fork: https://github.com/j9brown/decluttering-card

Pull request: https://github.com/custom-cards/decluttering-card/pull/78