remove unneeded parameters
AprsObject: merge setSeenFrom() into setLocation()
AprsObject: only take GeoAprsCoordinates
Allow for labels in GeoLineStringGraphicsItem.
GraticulePlugin: Use GeoGraphicsItems for rendering the grid
Use line width from line style

* Set pen with for lines from line style if available
  in GeoLineStringGraphicsItems
Allow for icons in icon style

* If an icon is set in icon style for a GeoPointGraphicsItem
  draw it at the point's position
MeasureToolPlugin: WIP: Port to GeoGraphicsItems