Allow element position edition by GPS coordinates

[brunetton]

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I'm trying to manually place elements on a map with a good precision (not importing from geojson, but using UI)

I'm copying GPS coordinates (example 50.92350,2.11022) from another online tool (https://www.geoportail.gouv.fr) and I'd like to be able to quickly paste them to a marker on map.

For now I've to separate longitude from latitude, and copy/paste them separately on the properties of my newly created marker:

I'd like to have another field titled "GPS coordinates" that is the representation of the coordinates as GPS format (lat and log separated by a comma) that could be used to:

• quickly copy coordinates to standard format
• quickly paste coordinates from standard format to set the new marker position (from https://www.openstreetmap.org for example)

This is somehow related to #1000