.. map is styled using "snazzymaps.com" css template
.. but it looks naff, loads slowly and adds a dependency
on embedding a QWebEngineView, which is one of the
reasons we're developing this in the first place (!)
.. it shows how to embed charts in the dashboard, so that
proxy code will be useful in the future.
.. likely to replace the google map visualisation with a
GPS route pixmap and route profile using altitude in
the next commit or two.
