wrap all library code into namespace if VCMI_LIB_NAMESPACE is defined

preparation for having client and server in a single process

lib/filesystem/AdapterLoaders.cpp

@@ -13,6 +13,8 @@
 #include "../JsonNode.h"
 #include "Filesystem.h"
 
+VCMI_LIB_NAMESPACE_BEGIN
+
 CMappedFileLoader::CMappedFileLoader(const std::string & mountPoint, const JsonNode &config)
 {
 	for(auto entry : config.Struct())
@@ -181,3 +183,5 @@ bool CFilesystemList::removeLoader(ISimpleResourceLoader * loader)
 	}
 	return false;
 }
+
+VCMI_LIB_NAMESPACE_END