[AltServer] Uses GrandSlam Authentication

Uses Mail.app plug-in to retrieve the computer’s anisette data, which is necessary for GSA.

AltPlugin/ALTPluginService.h

@@ -0,0 +1,19 @@
+//
+//  ALTPluginService.h
+//  AltPlugin
+//
+//  Created by Riley Testut on 11/14/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface ALTPluginService : NSObject
+
++ (instancetype)sharedService;
+
+@end
+
+NS_ASSUME_NONNULL_END