Fix theme color and add a demo panel for it.

[DomNomNom]

• Fixes theme colors not updating with changes to the AudioLink.cs object.

• Make the feature visible to people browsing the panels.

[pema99]

Gonna check this out locally later. Looks good at first glance

[pema99]

This seems to be working great locally. Address that nitpick and I'll merge.

[pema99]

thanks