Explore HTML plugins idea

[melonamin]

#261 adds web view poppers, which can present remote URLs as well as local HTML files.

Potentially it opens an opportunity to create custom plugin UI with HTML, like this ~ugly~ example:

HTML file content

```HTML

Home Link 1 Link 2 Link 3 Link 4 Link 5 Link 6 Link 7 Link 8 Link 9 Link 10

```

I need to figure out how to properly process clicks\actions, but I think most of it could be done through URL schemes.