added back the ability to set the uwp sdk version in cmd line args

Author: StephenHodgson

Assets/MixedRealityToolkit/Utilities/BuildAndDeploy/UwpAppxBuildTools.cs

@@ -257,7 +257,7 @@ private static void UpdateDependenciesElement(XElement dependencies, XNamespace
                 EditorUserBuildSettings.wsaUWPSDK = windowsSdkPaths[windowsSdkPaths.Length - 1];
             }
 
-            string maxVersionTested = UwpBuildDeployPreferences.MIN_SDK_VERSION;
+            string maxVersionTested = EditorUserBuildSettings.wsaUWPSDK;
 
             if (string.IsNullOrWhiteSpace(EditorUserBuildSettings.wsaMinUWPSDK))
             {

Assets/MixedRealityToolkit/Utilities/BuildAndDeploy/UwpPlayerBuildTools.cs

@@ -34,6 +34,10 @@ private static void ParseBuildCommandLine(ref UwpBuildInfo buildInfo)
                     case "-rebuildAppx":
                         buildInfo.RebuildAppx = true;
                         break;
+                    case "-targetUwpSdk":
+                        // Note: the min sdk target cannot be changed.
+                        EditorUserBuildSettings.wsaUWPSDK = arguments[++i];
+                        break;
                 }
             }
         }