Fixed #4 - Adding BuildIndex getter.

Author: NibbleByte

Assets/DevLocker/Utils/SceneReference.cs

@@ -84,8 +84,16 @@ public string ScenePath
 		/// </summary>
 		public string SceneName => Path.GetFileNameWithoutExtension(ScenePath);
 
+		/// <summary>
+		/// Is scene actually set to this instance?
+		/// </summary>
 		public bool IsEmpty => string.IsNullOrEmpty(ScenePath);
 
+		/// <summary>
+		/// Get the index of the scene in the build settings.
+		/// </summary>
+		public int BuildIndex => UnityEngine.SceneManagement.SceneUtility.GetBuildIndexByScenePath(ScenePath);
+
 		public SceneReference() { }
 
 		public SceneReference(string scenePath)