wrap all library code into namespace if VCMI_LIB_NAMESPACE is defined

preparation for having client and server in a single process

lib/serializer/JsonDeserializer.cpp

@@ -14,6 +14,8 @@
 
 #include <vstd/StringUtils.h>
 
+VCMI_LIB_NAMESPACE_BEGIN
+
 JsonDeserializer::JsonDeserializer(const IInstanceResolver * instanceResolver_, const JsonNode & root_):
 	JsonTreeSerializer(instanceResolver_, &root_, false, false)
 {
@@ -281,3 +283,5 @@ void JsonDeserializer::readLICPart(const JsonNode & part, const TDecoder & decod
 	}
 }
 
+
+VCMI_LIB_NAMESPACE_END