Add support for Apple Silicon

-Update classes to read correct Apple Silicon CPU sensor
-Update project to compile a Universal 2 binary. Upgraded Sparkle to 2.1.0 as that was the latest and supports ARM64.
-Add MacBookPro18,1 to Machines.plist

Sparkle.framework/Versions/B/Headers/SPUStandardUserDriverDelegate.h

@@ -0,0 +1,64 @@
+//
+//  SPUStandardUserDriverDelegate.h
+//  Sparkle
+//
+//  Created by Mayur Pawashe on 3/3/16.
+//  Copyright © 2016 Sparkle Project. All rights reserved.
+//
+
+#if __has_feature(modules)
+#if __has_warning("-Watimport-in-framework-header")
+#pragma clang diagnostic ignored "-Watimport-in-framework-header"
+#endif
+@import Foundation;
+#else
+#import <Foundation/Foundation.h>
+#endif
+#import <Sparkle/SUExport.h>
+
+@protocol SUVersionDisplay;
+
+/**
+ A protocol for Sparkle's standard user driver's delegate
+ 
+ This includes methods related to UI interactions
+ */
+SU_EXPORT @protocol SPUStandardUserDriverDelegate <NSObject>
+
+@optional
+
+/**
+ Called before showing a modal alert window,
+ to give the opportunity to hide attached windows that may get in the way.
+ */
+- (void)standardUserDriverWillShowModalAlert;
+
+/**
+ Called after showing a modal alert window,
+ to give the opportunity to hide attached windows that may get in the way.
+ */
+- (void)standardUserDriverDidShowModalAlert;
+
+/**
+ Returns an object that formats version numbers for display to the user.
+ If you don't implement this method or return @c nil, the standard version formatter will be used.
+ */
+- (_Nullable id <SUVersionDisplay>)standardUserDriverRequestsVersionDisplayer;
+
+/**
+ Handles showing the full release notes to the user.
+ 
+ When a user checks for new updates and no new update is found, Sparkle will offer to show the application's version history to the user
+ by providing a "Version History" button in the no new update available alert.
+ 
+ If this delegate method is not implemented, Sparkle will instead offer to open the
+ `fullReleaseNotesLink` (or `releaseNotesLink` if the former is unavailable) from the appcast's latest `item` in the user's web browser.
+ 
+ If this delegate method is implemented, Sparkle will instead ask the delegate to show the full release notes to the user.
+ A delegate may want to implement this method if they want to show in-app or offline release notes.
+ 
+ @param item The appcast item corresponding to the latest version available.
+ */
+- (void)standardUserDriverShowVersionHistoryForAppcastItem:(SUAppcastItem *_Nonnull)item;
+
+@end