Reduce duplication of place update code

Merged Marcus Lundblad requested to merge wip/mlundblad/reduce-dup-place-init into master

The place update code in osmUtils.js and overpass.js contains some duplication. Refactor this into place.js to make it less cumbersome to add new detail fields in the future.

Implements #398 (closed)

Edited by Marcus Lundblad

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