Feature Request: Make the theme changing button into a dropdown select

[penguinmoose]

I think it would be better to turn the theme changing button into a dropdown menu/select. That way, someone can view all the available themes and jump to a desired one without having to cycle through all of them. Also, this is the usual way of choosing a theme - I thought that the change theme button actually opens a dropdown.

Also, it isn’t hard to style a dropdown. I’m pretty sure there are CSS selectors that activate with a certain selected item - that can even replace the CSS variables (I think).