Added a ValidateProject method to build tools (#770)

* Added a ValidateProject method to build tools

* lets exit the app properly too

Editor/BuildAndDeploy/UnityPlayerBuildTools.cs

@@ -14,6 +14,7 @@
 using UnityEngine;
 using XRTK.Extensions;
 using XRTK.Editor.Utilities;
+using XRTK.Editor.Utilities.SymbolicLinks;
 using Debug = UnityEngine.Debug;
 
 namespace XRTK.Editor.BuildAndDeploy
@@ -146,6 +147,26 @@ public static BuildReport BuildUnityPlayer(IBuildInfo buildInfo)
             return buildReport;
         }
 
+        /// <summary>
+        /// Validates the Unity Project assets by forcing a symbolic link sync and creates solution files.
+        /// </summary>
+        [UsedImplicitly]
+        public static void ValidateProject()
+        {
+            try
+            {
+                SymbolicLinker.RunSync(true);
+                SyncSolution();
+            }
+            catch (Exception e)
+            {
+                Debug.LogError(e);
+                EditorApplication.Exit(1);
+            }
+
+            EditorApplication.Exit(0);
+        }
+
         /// <summary>
         /// Force Unity To Write Project Files
         /// </summary>