Allow extensions on the root element

[lnicola]

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Fixes #90

[urschrei]

This is https://www.topografix.com/GPX/1/1/#type_extensionsType, right? It's so vague.

[lnicola]

The file is.. GPX 1.0?

<gpx xmlns:gpxdata="http://www.cluetrust.com/XML/GPXDATA/1/0" xmlns:gpxx="http://www.garmin.com/xmlschemas/GpxExtensions/v3" version="1.1" xmlns="http://www.topografix.com/GPX/1/1" xmlns:rmc="urn:net:trekbuddy:1.0:nmea:rmc" xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v1" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.garmin.com/xmlschemas/GpxExtensions/v3 http://www.garmin.com/xmlschemas/GpxExtensionsv3.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v1 http://www.garmin.com/xmlschemas/TrackPointExtensionv1.xsd http://www.garmin.com/xmlschemas/WaypointExtension/v1 http://www.garmin.com/xmlschemas/WaypointExtensionv1.xsd http://www.qlandkarte.org/xmlschemas/v1.1 http://www.qlandkarte.org/xmlschemas/v1.1/ql-extensions.xsd http://www.cluetrust.com/XML/GPXDATA/1/0 http://www.cluetrust.com/Schemas/gpxdata10.xsd" xmlns:wptx1="http://www.garmin.com/xmlschemas/WaypointExtension/v1" xmlns:ql="http://www.qlandkarte.org/xmlschemas/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" creator="QMapShack 1.16.1 http://www.qlandkarte.org/" xmlns:tp1="http://www.garmin.com/xmlschemas/TrackPointExtension/v1">

[lnicola]

https://www.topografix.com/GPX/1/1/#element_gpx shows it more clearly.

[lnicola]

bors r=urschrei

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• ci result

[lnicola]

Published as v0.9.1.