Resolve "Refactorings/Clean-Up"

Closes #39 (closed)

ragconnect.base/src/main/jastadd/Intermediate.jadd

@@ -333,6 +333,10 @@ aspect MustacheRagConnect {
 
   // === MappingDefinition ===
   syn boolean MappingDefinition.isUsed() = !effectiveUsedAt().isEmpty();
+  eq SerializeListMapping.isUsed() = ragconnect().defaultListToBytesMapping().isUsed();
+  eq SerializeJavaUtilListMapping.isUsed() = ragconnect().defaultJavaUtilListToBytesMapping().isUsed();
+  eq DeserializeListMapping.isUsed() = program().typeDecls().stream().anyMatch(
+          typeDecl -> ragconnect().defaultBytesToListMapping(typeDecl.getName()).isUsed());
 
   // === attributes needed for computing above ones ===
   syn List<EndpointDefinition> RagConnect.givenEndpointDefinitionList() {