Update XML common version to 2.0.0:
- Changed license (Apache License, version 2.0)
- Requires Sampling v2.0 decoder changes:
  - sampledFeature multiplicity changed from 1..1 to 1..*
Merge pull request #124 from CarstenHollmann/feature/use_xml_common_200

Update XML common version to 2.0.0: