[mkgmap-dev] [PATCH v1] Performance improvement by removing unused elements before the style processing

Hi, this is another performance improvement: Usually the mkgmap input tiles are larger than the processed bounding box (splitter parameter overlap). So there are much many elements which are processed but thrown away at a late step in mkgmap. The patch tries to remove them much earlier before the style files are processed and before the LocationHook starts (which ignores them but that must also be calculated). The patch contains one drawback: Ways which have all its points outside the bounding box of the tile but which cross the tile are also removed. If that's a point the patch must be improved. Have fun! WanMil