feat: integrate AMESim media models and editor UI

tests/test_system_xml_protocol.py

@@ -87,6 +87,7 @@ class SystemXmlProtocolTests(unittest.TestCase):
         self.assertEqual(root.attrib["name"], "protocol-test")
         self.assertEqual(root.attrib["schemaVersion"], "2")
         self.assertEqual(root.attrib["unitSystem"], "SI")
+        self.assertEqual(root.attrib["mediumReferenceVersion"], "1")
         self.assertEqual(
             [child.tag for child in root],
             ["Simulation", "Components", "Connections"],