Initial commit

Assets/CGHierarchyIcons/Editor/UnityCallbacks/DestroyInstancesOnBuild.cs

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+using System;
+using System.Collections.Generic;
+using HierarchyIcons;
+using UnityEditor;
+using UnityEditor.Callbacks;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+// https://forum.unity.com/threads/excluding-certain-monobehaviour-classes-from-build.568090/#post-3779695
+public class DestroyInstancesOnBuild : MonoBehaviour
+{
+    [PostProcessScene]
+    public static void DeleteObjects()
+    {
+        if (BuildPipeline.isBuildingPlayer)
+        {
+            Type type = typeof(HierarchyIcon);
+            Debug.Log("Destroying all instances of '" + type.Name + "' from scenes on build!");
+
+            foreach (Component obj in FindObjectsOfTypeAll(type, true))
+                DestroyImmediate(obj);
+        }
+    }
+
+    static List<Component> FindObjectsOfTypeAll(Type type, bool findInactive = false)
+    {
+        List<Component> results = new List<Component>();
+        for (int i = 0; i < SceneManager.sceneCount; i++)
+        {
+            Scene scene = SceneManager.GetSceneAt(i);
+            if (scene.isLoaded)
+            {
+                GameObject[] allGameObjects = scene.GetRootGameObjects();
+                for (int j = 0; j < allGameObjects.Length; j++)
+                {
+                    GameObject go = allGameObjects[j];
+                    results.AddRange(go.GetComponentsInChildren(type, findInactive));
+                }
+            }
+        }
+
+        return results;
+    }
+}

Assets/CGHierarchyIcons/Editor/UnityCallbacks/DestroyInstancesOnBuild.cs.meta

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+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/CGHierarchyIcons/Editor/UnityCallbacks/ShowIconOnHierarchyView.cs

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+using HierarchyIcons;
+using UnityEngine;
+using UnityEditor;
+
+namespace CGHierarchyIconsEditor
+{
+    [InitializeOnLoad]
+    public class ShowIconOnHierarchyView
+    {
+        const float MAX_ICON_SIZE = 16;
+
+        static ShowIconOnHierarchyView()
+        {
+            EditorApplication.hierarchyWindowItemOnGUI += HierarchyWindowItemCallback;
+        }
+
+        static void HierarchyWindowItemCallback(int instanceID, Rect selectionRect)
+        {
+            GameObject gameObject = EditorUtility.InstanceIDToObject(instanceID) as GameObject;
+            if (gameObject == null)
+                return;
+
+            HierarchyIcon[] hierarchyIcons = gameObject.GetComponents<HierarchyIcon>();
+            foreach (HierarchyIcon hierarchyIcon in hierarchyIcons)
+            {
+                Texture2D icon = hierarchyIcon.icon ? hierarchyIcon.icon : TextureHelper.NO_ICON;
+                float width = Mathf.Min(icon.width, MAX_ICON_SIZE);
+                float height = Mathf.Min(icon.height, MAX_ICON_SIZE);
+
+                // get the starting x position based on the direction
+                float x = selectionRect.x;
+                if (hierarchyIcon.direction == HierarchyIcon.Direction.LeftToRight)
+                    x += hierarchyIcon.position * MAX_ICON_SIZE;
+                else
+                    x += (selectionRect.width - width) - hierarchyIcon.position * MAX_ICON_SIZE;
+
+                // draw the icon
+                Rect rect = new Rect(x, selectionRect.y, width, height);
+                GUI.DrawTexture(rect, icon);
+
+                // set link cursor
+                EditorGUIUtility.AddCursorRect(rect, MouseCursor.Link);
+
+                // and draw a button for change the icon and display the tooltip
+                if (GUI.Button(rect, new GUIContent(string.Empty, hierarchyIcon.tooltip), EditorStyles.label))
+                    PopupWindow.Show(rect, new PickIconWindow(hierarchyIcon));
+            }
+        }
+    }
+}

Assets/CGHierarchyIcons/Editor/UnityCallbacks/ShowIconOnHierarchyView.cs.meta

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+timeCreated: 1516518841
+licenseType: Store
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+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
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