Don't disable prefabs that are used in GameObjectItemsSetter

[Christian Oeing]

From https://forum.unity3d.com/threads/released-data-bind-for-unity.298471/page-3#post-3010057

"Deactivate prefab of GameObjectItemsSetter on Awake, so it isn't visible even if a scene game object is used". That's cool but you actually deactive the prefab it self, which mean, the prefab in the project tab get deactivate too. Annoying if you use it somewhere else . Could you talk a look for a fix."

[Christian Oeing]

When in editor the prefab shouldn't be disabled if it is really a prefab (not a scene object). In editor this can be checked with PrefabUtility.GetPrefabType: http://answers.unity3d.com/questions/218429/how-to-know-if-a-gameobject-is-a-prefab.html

[Christian Oeing]

Added unit tests and fixes, so prefabs aren't disabled when running the application in the editor

[Christian Oeing]

Removing milestone: 1.0.8 (automated comment)