Raphael Grimm 1b11773cd6 Allow to add metadata to json nodes ... * by default no metadata is allowed and the library behaves as it already did * if a user explicitly adds metadata (last template parameter) each node has a data member of this type and access functions for this member * add test for this feature		2021-09-24 23:32:20 +02:00
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nlohmann	Allow to add metadata to json nodes	2021-09-24 23:32:20 +02:00