Switching from JS globe coordinate parser to back-end parser

Instead of using the front-end globe coordinate parser, the back-end's GeoCoordinate parser
is used via the API. Instead of managing just plain strings as raw values, still, the
GlobeCoordinate experts need to additionally deal with GlobeCoordinate objects since, for
example, when loading an entity, the experts are initialized with the values of the entity's
DataValues - those do not need additional parsing.

Change-Id: I30cb202fcc9600a4a621d92d39c91ebdba802f91
Merge "Switching from JS globe coordinate parser to back-end parser"