Import: Bus stops from GTFS

Yes, this was silly of me - I thought it would be more appropriate to delete the old address tags in a separate script. On second thought it’s really not, so I’ve now added that in and ran the script again: OSMCha

I’m still using source=israel_gtfs to identify which stops are imported and which are manually added. The script will only delete stops that have the source=israel_gtfs tag.