Base: Disable XML external entity expansion

Addresses https://github.com/FreeCAD/FreeCAD/security/code-scanning/29

src/Base/Parameter.cpp

@@ -1872,6 +1872,7 @@ int ParameterManager::LoadDocument(const XERCES_CPP_NAMESPACE_QUALIFIER InputSou
     parser->setDoSchema(gDoSchema);
     parser->setValidationSchemaFullChecking(gSchemaFullChecking);
     parser->setCreateEntityReferenceNodes(gDoCreate);
+    parser->setDisableDefaultEntityResolution(true);
 
     auto errReporter = new DOMTreeErrorReporter();
     parser->setErrorHandler(errReporter);