Merge with latest changes from EHJ-52n:develop

En- or disable Addition of offering metadata to sensor/procedure outputs
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- Add switch to SensorDescriptionBuilder to en- or disable addition of offering metadata to sensor/procedure outputs. Tried to implement a downwardly compatible way.
- Improved some javadoc

Extract Third Party Modules
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- Added new module: 52n-third-party
- Moved third party content to new submodules of 52n-third-party
- NanoHTTPD
- NCName resolver
- Saxon
- minor pom stuff