ElrsTelemWidget v3

Updates the widget to support ExpressLRS 3.x (and 2.x still). Note that the v3 version of this widget is just a coincidence, not indicating compatibility with any particular version.

• Adds ExpressLRS 3.x modes. Fixes "Attempt to concatenate nil with string" or whatnot and incorrect mode labels displayed
• Display module display name and version when no receiver has been connected