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oamc: Don't list suburbs or neighbourhoods as cities.

They're parts of bigger places and not autonomous places.  The word
suburb in OSM is used differently from its English use.
oamc: Rough addr:place= tag support.

This simply uses the value of the addr:place tag if addr:street is
not present.  Since OsmAnd doesn't associate the address streetnames
with actual streets in the data (unlike Nominatim), the streetname
is simply a string used in address search.  So using the place name
instead still works fine.
oamc: Give max priority to addr:city in address search.

We refactor the logic of searching for a city that contains a given
address by, among other things, giving the value listed in addr:city a
higher priority than is_in ("deprecated") and boundaries or nearby
place=* nodes.