SG-6836: [minor] Implements a hard_refresh method on the publish type model.

This works in conjunction with additional changes in tk-framework-shotgunutils to fix the reload menu command for loader2.

Author: thebeeland

python/tk_multi_loader/model_publishtype.py

@@ -205,6 +205,13 @@ def set_active_types(self, type_aggregates):
 
         # and ask the model to resort itself 
         self.sort(0)
+
+    def hard_refresh(self):
+        """
+        Clears any caches on disk, then refreshes the data.
+        """
+        super(SgPublishTypeModel, self).hard_refresh()
+        self._load_external_data()
 
     ############################################################################################
     # subclassed methods