QMS is currently able to load Garmin Trackpoint Extensions if they are stored in the namespace
If another namespace is used - even if declared correctly in the
<gpx ...> node - the extensions will not be recognized as known extensions.
To get around this limitation we need to read the namespaces declared in the
<gpx ...> node and setup the internal QHash in
This report is primarily a reminder for myself; I'm going to implement this at some point (if nobody did already)