Release 0.52.2
- cbor: add round-trip tests
- cxon/json: add pretty/tidy code in the lib
- cxon: move node.ordered.hxx from test to cxon/lib (useful when object's content order has to be preserved)
- test: run the tests with -O3 by default
- cxon/json: handle g++ false-positive warning with -O3
- cxon: minor fixes here and there