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/SUVersionComparisonProtocol.h

@@ -0,0 +1,49 @@
+//
+//  SUVersionComparisonProtocol.h
+//  Sparkle
+//
+//  Created by Andy Matuschak on 12/21/07.
+//  Copyright 2007 Andy Matuschak. All rights reserved.
+//
+
+#ifndef SUVERSIONCOMPARISONPROTOCOL_H
+#define SUVERSIONCOMPARISONPROTOCOL_H
+
+#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
+
+#ifdef BUILDING_SPARKLE_TOOL
+// Ignore incorrect warning
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wquoted-include-in-framework-header"
+#import "SUExport.h"
+#pragma clang diagnostic pop
+#else
+#import <Sparkle/SUExport.h>
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+    Provides version comparison facilities for Sparkle.
+*/
+@protocol SUVersionComparison
+
+/**
+    An abstract method to compare two version strings.
+
+    Should return NSOrderedAscending if b > a, NSOrderedDescending if b < a,
+    and NSOrderedSame if they are equivalent.
+*/
+- (NSComparisonResult)compareVersion:(NSString *)versionA toVersion:(NSString *)versionB; // *** MAY BE CALLED ON NON-MAIN THREAD!
+
+@end
+
+NS_ASSUME_NONNULL_END
+#endif