[devtools] Add Player instance highlight

[rafbcampos]

We can have multiple Player instances on the same page. Although the basic dev tools plugin has a dropdown to select different Player instances, they are shown as IDs.

So this is an issue for adding support to highlight the currently inspected Player when we select the instance in the dropdown and add an icon button to highlight the Player instance being inspected when the user clicks on it.

Possible solutions on how to highlight the Player instance:

• Add an ID to the WrapperComponent and add a script into the extension to add a border to an element for a given ID; or
• Use a ContentScript to wrap the component based on an ID; or
• Add an Event to highlight based on the Player ID, and hook that into the WrappedComponent, so we add/remove a class to add a border.