Support multiple names

[christophlingg]

Sometimes OSM items have more than one name which are stored in tags like int_name, alt_name, loc_name, official_name ...

photon would benefit to consider these names too

[christophlingg]

we know import alternatives names f2eef0b

they still need to be considered by the search logic

[karussell]

related/duplicate #33, #49 ?

[christophlingg]

additional name fields are now importedhttps://github.com/komoot/photon/blob/master/src/main/java/de/komoot/photon/importer/Utils.java#L80

and used in search config
https://github.com/komoot/photon/blob/master/es_config/mappings.json#L202