wrap all library code into namespace if VCMI_LIB_NAMESPACE is defined

preparation for having client and server in a single process

lib/mapping/MapFormatJson.cpp

@@ -30,6 +30,8 @@
 #include "../serializer/JsonDeserializer.h"
 #include "../serializer/JsonSerializer.h"
 
+VCMI_LIB_NAMESPACE_BEGIN
+
 class MapObjectResolver: public IInstanceResolver
 {
 public:
@@ -1364,3 +1366,5 @@ void CMapSaverJson::writeObjects()
 	addToArchive(data, OBJECTS_FILE_NAME);
 }
 
+
+VCMI_LIB_NAMESPACE_END