[Feature]: HTML support for MDI Icons

[oerix]

Requirements

• I have updated Mushroom to the latest available version
• I did a search to see if there is a similar issue or if a pull request is open.

Is your feature request related to a problem?

Unable to use mdi icons in text fields other than icon.

Describe the solution you'd like

It would be great if mushroom cards supported html, so we could utilise mdi:icons to be used in other fields like: name, title, subtitle etc.

Describe alternatives you've considered

I'm not sure if it's possible using card-mod, but it would still be great to have native support instead of a hacky way.

Additional context

Many thanks