Consider `namespacePrefixes` when marshalling `QName`s

[highsource]

See highsource/ogc-schemas#36.

namespacePrefixes declared on the Jsonix content are not consideren when marshalling QNames defined as strings.

[highsource]

Don't close yet, I'll check if both output/input should be considered on reprinting.

[highsource]

I've checked, only output should be considered on reprinting as input is not available.