moving more code to @properties, ReferenceBuilder WIP

MacPass/MPViewController.h

@@ -10,10 +10,12 @@
 
 @interface MPViewController : NSViewController
 
+@property (nonatomic, readonly) NSWindowController *windowController;
+
 - (void)didLoadView;
 - (NSResponder *)reconmendedFirstResponder;
 /* Returns the associated window controller */
-- (id)windowController;
+
 
 - (void)updateResponderChain;