perf: Enhance and fix merging algorithm #76
+150
−89
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Description
Update the merging algorithm to take into account both start and end point.
Make it more robust so that in one call to merge ways function, all ways are merged.
Take into account the strange merge (start+start/end+end) that were causing problems on the rivers.
This will help the simplify algorithm and it will reduce the number of roads which might also reduce the number of points with simplify and so reduce the size of the SVG.
It will help #59