added output dir shortcut to perception camera inspector

com.unity.perception/Editor/GroundTruth/PerceptionCameraEditor.cs

                 //EditorGUILayout.PropertyField(serializedObject.FindProperty(nameof(PerceptionCamera.labelers)));
                 m_LabelersList.DoLayoutList();
             }
+
+            var dir = PlayerPrefs.GetString(SimulationState.latestOutputDirectoryKey, string.Empty);
+            if (dir != string.Empty)
+            {
+                EditorGUILayout.LabelField("Latest Output Folder:");
+                GUILayout.BeginVertical("TextArea");
+                EditorGUILayout.HelpBox(dir, MessageType.None);
+                GUILayout.BeginHorizontal();
+                if (GUILayout.Button("Show Folder"))
+                {
+                    EditorUtility.RevealInFinder(dir);
+                }
+                if (GUILayout.Button("Copy Path"))
+                {
+                    GUIUtility.systemCopyBuffer = dir;
+                }
+                GUILayout.EndHorizontal();
+                GUILayout.EndVertical();
+            }
+
             if (EditorSettings.asyncShaderCompilation)
             {
                 EditorGUILayout.HelpBox("Asynchronous shader compilation may result in invalid data in beginning frames. " +

com.unity.perception/Runtime/GroundTruth/SimulationState.cs

         float m_LastTimeScale;
         readonly string m_OutputDirectoryName;
         string m_OutputDirectoryPath;
+        public const string latestOutputDirectoryKey = "latestOutputDirectory";
 
         JsonSerializer m_AnnotationSerializer;
         public bool IsRunning { get; private set; }
             m_AnnotationSerializer.Converters.Add(new Vector3Converter());
             m_AnnotationSerializer.Converters.Add(new QuaternionConverter());
             m_OutputDirectoryName = outputDirectory;
+
+            PlayerPrefs.SetString(latestOutputDirectoryKey, Manager.Instance.GetDirectoryFor("",""));
+
             IsRunning = true;
         }