Validate QName inputs

[FilipJirsak]

QName doesn't validate inputs, so it is possible to create QName for example with '<' in the tag name.

The bug was reported by @mario-areias, thanks!

[vdotjansen]

I see this is fixed in both 2.0.3 and 2.1.1, when is 2.0.3 to be released?

[Marcono1234]

@FilipJirsak, doesn't the same issue also apply to the uri field?

[wilx]

Will there be a 2.0.x release with this fix? We have to support older software that has to run with Java 7 still.