Map attributes

[mikesplain]

Add the ability to map attributes the way we already can for map_state. This works well for things like media players where you may want to look up attribute values and map it to ui values.

Fixes #109

[nervetattoo]

Awesome, thanks!
Only problem is that the latest version of the code resides in the beta branch and has been ported to Typescript and re-organized. Do you want to re-apply the fix towards the beta branch? If not I can manually merge it and port it when I find the time, making sure that I attribute the commit to you.

[mikesplain]

Thanks @nervetattoo! Rebased and retargeted to the beta branch, thanks for the clean migration to TS, super easy rebase. Let me know if you need anything else from me!

[nervetattoo]

Looked clean and nice. Thanks for the addition, it makes super sense so 👍

[github-actions]

🎉 This PR is included in version 1.0.0-beta.3 🎉

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[mikesplain]

Awesome thanks! I have some more code that I’ll rework and contribute soon too. Thanks for the great plugin!