Allow showing and hiding individual items in the title bar with a right-click menu

This presents a special challenge on Windows as we do not receive mouse events when right clicking draggable regions: https://github.com/electron/electron/issues/24893

I've leveraged [this PR](https://github.com/microsoft/vscode/pull/155276) to try out intercepting the events in the main thread and passing the necessary information to the render process.

