[GPX] added support for fractional digit in timestamps #108
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The GPX-Standard allows timestamps with fractional digits.
To export such files and benefit from higher GPX resolution, I've added the option to export a GPX File with timestamps having fractional digits.
It is an opt-in feature. The default export does not have fractional digits to ensure compatibility.
I've also switched to the ISO8601 Dateformatter for Apple Platforms.
https://developer.apple.com/documentation/foundation/iso8601dateformatter