pvxput handle JSON #746

Job	Run time
Linux centos 7	7m 0s
Linux fedora latest	5m 18s
Native Linux (WError)	5m 6s
Native Linux (libc++ debug)	6m 12s
Native Linux (c++17)	5m 26s
Cross mingw64 DLL	9m 52s
Cross mingw64 static	10m 43s
RTEMS5	17m 33s
Native Linux with clang	4m 34s
Native Linux with libevent stable	5m 17s
Native Linux with 7.0.2	5m 28s
Native Linux with 3.15	4m 19s
Native Linux with 3.14	2m 58s
OSX	7m 21s
vs2019 DLL	8m 58s
vs2019 static	9m 20s
	1h 55m 25s

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