Show an indicator icon for each active connection

## Problem

If you are connected to multiple networks (e.g. wired and wireless, or wireless and USB), we currently only show one connection icon. At a glance it is not obvious you actually still have the other connection active.

## Proposal

Show an icon for each active connection (type) in the panel, i.e. both a wired and wireless icon if you are connected to both.

## Prior Art

Android at least shows both cellular signal and Wi-Fi signal alongside one another. I believe iOS does as well.