Error reporting for submodels

Also add some error codes I forgot for AI and traffic.

simgear/debug/ErrorReportingCallback.hxx

@@ -57,7 +57,9 @@ enum class ErrorCode {
     AudioFX,
     XMLLoadCommand,
     AircraftSystems,
-    InputDeviceConfig
+    InputDeviceConfig,
+    AITrafficSchedule,
+    AirportDataLoad // ground-net, jetways, etc
 };
 /**
  @brief Define an error-reporting context value, for the duration of this

simgear/scene/model/SGReaderWriterXML.cxx

@@ -323,9 +323,12 @@ sgLoad3DModel_internal(const SGPath& path,
                 if (!texturePathStr.empty())
                 {
                     texturepath = SGModelLib::findDataFile(texturePathStr, NULL, modelDir);
-                    if (texturepath.isNull())
+                    if (texturepath.isNull()) {
+                        simgear::reportFailure(simgear::LoadFailure::NotFound, simgear::ErrorCode::LoadingTexture,
+                                               "Texture file not found:" + texturePathStr, path);
                         throw sg_io_exception("Texture file not found: '" + texturePathStr + "'",
                                 path);
+                    }
                 }
             }
         } else {
@@ -426,6 +429,9 @@ sgLoad3DModel_internal(const SGPath& path,
 
         if (submodelPath.isNull()) {
           SG_LOG(SG_IO, SG_DEV_ALERT, "Failed to load file: \"" << subPathStr << "\"");
+          simgear::reportFailure(simgear::LoadFailure::NotFound, simgear::ErrorCode::XMLModelLoad,
+                                 "Couldn't find file for submodel:" + subPathStr,
+                                 SGPath::fromUtf8(subPathStr));
           continue;
         }
 
@@ -438,6 +444,8 @@ sgLoad3DModel_internal(const SGPath& path,
             }
         }
 
+        simgear::ErrorReportContext("submodel", submodelPath.utf8Str());
+
         try {
             int num_anims;
             std::tie(num_anims, submodel) = sgLoad3DModel_internal(submodelPath, options.get(),