Add an enum for addr:place for OsmAndMapCreator to use.

addr:place=* support is very important for address search in some
countries.  Nominatim and most other tools support it.
Add CityType.NEIGHBOURHOOD for OsmAndMapCreator.

place=neighbourhood is gaining popularity for about two years in OSM
tagging and is supported by other tools as a subdivision of a
place=suburb and similar.
Merge pull request #691 from balrog-kun/master

Consts for addr:place=* and place=neighbourhood.