UnsupportedProperties as static field

[jansule]

Feature Request

Is your feature request related to a problem? Please describe.

It would be great to have the unsupportedProperties as static property instead of an instance property. This would allow to use the unsupportedProperties property without having to instantiate a parser.

Describe the solution you'd like

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Describe alternatives you've considered

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Additional context

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[KaiVolland]

As an less invasive alternative we could move the value of the unsupported properties in every parser to its own variable outside of the parser class.

The class could then reuse it and the variable could also be exported.