Adding initial work on the goeloop and going to faithfully port s2polyline into spatial4j for use fo the intersection math"
Adding stub code for S2Polyline direct port
Adding first part of S2Polyline port into Spatial4j
In implementing centroids, needs normal method but doesn't know where to find this in the C++ port
Updating vector utils to contain itnerfaces for methods I need, updating polyline port and some notes for next tasks