Demo Preparation

Remove autotagging from LiveGraph (tag in an AgeableValue is ignored
for now).
Invert colors in LiveGraph.
Clear topic LiveGraph when feedback on a new topic is received.
Show topic being LiveGraphed in a separate label.
Notifications can come in off the main thread (protect against).
Add Multipeer notification when we send data (not just when we receive
it).
Tag General feedback whenever a new topic is sent out.
Possible known problem: The min/maxValue autoranging in LiveGraph
probably doesn’t work (so set them explicitly always).