Cyril Li

Experimental support for inserting custom data from GPX file

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Fixes #148 ### Context Inserting custom data is useful to display values computed by an external program. I have wrote some brief docs about this in docs/xml/README.md ### Contributor Checklist...

to_xml removes metadata extensions without the name tag present

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Test code: ```python import gpxpy gpx = gpxpy.parse("""\ Name value """) print(gpx.metadata_extensions) # [] gpx.name = None print(gpx.to_xml()) """ """ gpx = gpxpy.parse(gpx.to_xml()) print(gpx.metadata_extensions) # [] ```

In the context of this program macOS works the same way as Linux, the only change needed is the filepath to the `imobiledevice` library.

0.127.0 (Custom GPX data + misc. improvements)

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Fixes #148 ### Context Inserting custom data is useful to display values computed by an external program. Specific additions in this version: - Custom data - Custom GPX metadata (global):...