Snap to multiple locations in map matching

[aoles]

The method which was originally used for obtaining multiple snap points has been removed in GH 4.0. For now this has been circumvented by snapping to the closest point. This might lead to sub-optimal results and incorrect matches, as the closest snapping point might not lie on the edge which one wants to match to. Therefore, for reliable map-matching the feature of matching to multiple points needs to re-introduced.

openrouteservice/openrouteservice/src/main/java/org/heigit/ors/mapmatching/hmm/HiddenMarkovMapMatcher.java

Lines 381 to 383 in b8feaac

	// TODO Postponed: find out how to do this now: List<Snap> qResults = locationIndex.findNClosest(lat, lon, edgeFilter);
	// TODO: this is just a temporary work-around for the previous line
	List<Snap> qResults = List.of(locationIndex.findClosest(lat, lon, edgeFilter));

[aoles]

Fixed via #1457.