decompose pip_cmg

add serialization/pijsonserialization.h for JSON de/serialization
add -J flag for pip_cmg to make JSON serialization methods
not finished yet, but basically workable now

libs/main/serialization/piserializationmodule.h

@@ -54,6 +54,7 @@
 #include "pibinarystream.h"
 #include "pichunkstream.h"
 #include "pijson.h"
+#include "pijsonserialization.h"
 #include "pivaluetree_conversions.h"
 
 #endif // PISERIALIZATIONMODULE_H