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/SUStandardVersionComparator.h

@@ -0,0 +1,70 @@
+//
+//  SUStandardVersionComparator.h
+//  Sparkle
+//
+//  Created by Andy Matuschak on 12/21/07.
+//  Copyright 2007 Andy Matuschak. All rights reserved.
+//
+
+#ifndef SUSTANDARDVERSIONCOMPARATOR_H
+#define SUSTANDARDVERSIONCOMPARATOR_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"
+#import "SUVersionComparisonProtocol.h"
+#pragma clang diagnostic pop
+#else
+#import <Sparkle/SUExport.h>
+#import <Sparkle/SUVersionComparisonProtocol.h>
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+    Sparkle's default version comparator.
+
+    This comparator is adapted from MacPAD, by Kevin Ballard.
+    It's "dumb" in that it does essentially string comparison,
+    in components split by character type.
+*/
+SU_EXPORT @interface SUStandardVersionComparator : NSObject <SUVersionComparison>
+
+/**
+    Initializes a new instance of the standard version comparator.
+*/
+- (instancetype)init;
+
+/**
+    A singleton instance of the comparator.
+ */
+@property (nonatomic, class, readonly) SUStandardVersionComparator *defaultComparator;
+
+/**
+    Compares two version strings through textual analysis.
+ 
+    These version strings should be in the format of x, x.y, or x.y.z where each component is a number.
+    For example, valid version strings include "1.5.3", "500", or "4000.1"
+    These versions that are compared correspond to the @c CFBundleVersion values of the updates.
+ 
+    @param versionA The first version string to compare.
+    @param versionB The second version string to compare.
+    @return A comparison result between @c versionA and @c versionB
+*/
+- (NSComparisonResult)compareVersion:(NSString *)versionA toVersion:(NSString *)versionB;
+
+@end
+
+NS_ASSUME_NONNULL_END
+#endif