Drop MultiPolygon parts outside the tile #171
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Drop parts of multipolygon inputs which lie outside the boundary of the tile, and clip to the clip boundary.
This can occur because we merge buildings with the same properties into large MultiPolygons. We want large buildings, such as the High Line, to continue beyond the bounds of the tile, but we don't need to keep other parts of the MultiPolygon which are completely outside of the tile. They'll be present in the neighbouring tile anyway.
This saves about 70% of the work of formatting the child tiles of a "512px" tile.