detect nodes with unneded highway=crossing

[mkoniecz]

Detection would be very similar to ​http://josm.openstreetmap.de/ticket/9141 - but with "node that may be left by foo in at least two directions" replaced by "node that may be left by foo in at least one direction" (crossing terminating footway/cycleway sometimes happen, also some people may stop mapping feature at this point).

And main check would be:

first rule:

" Any node with (((without foot access AND without bicycle access) OR (without road)) AND (with highway=crossing)) should be reported as "highway=crossing is probably not needed here"."

second rule:

" Any node with (((without foot access AND without bicycle access) OR (without road)) AND (with crossing=no)) should be reported as "crossing=no is probably not needed here"."