* - moved SMILES and RGroupDecomp JSON parsers to their own translation units
- added missing DLL export decorators that had been previously forgotten
- changed the signatures of MolToCXSmiles and updateCXSmilesFieldsFromJSON
to replace enum parameters with the underlying types
- updated ReleaseNotes.md
* make sure cxSmilesFields is only updated if the JSON string contains keys
belonging to the CXSmilesFields enum
* added missing copyright notices
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Co-authored-by: ptosco <paolo.tosco@novartis.com>
