Spatial Algorithms 0.2.5-neo4j-4.3.9

It turns out that in Neo4j 4.3 (not earlier) if we break from loops that iterate over relationships, the cursors are not cleaned up. We will report this as a bug to the Neo4j kernel developers, but we can work around it by never using break or continue label from within getRelationship loops. This required refactoring a few internal parts of the OSM model traversal and polygon/polyline building code.