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/SUExport.h

@@ -0,0 +1,18 @@
+//
+//  SUExport.h
+//  Sparkle
+//
+//  Created by Jake Petroules on 2014-08-23.
+//  Copyright (c) 2014 Sparkle Project. All rights reserved.
+//
+
+#ifndef SUEXPORT_H
+#define SUEXPORT_H
+
+#ifdef BUILDING_SPARKLE
+#define SU_EXPORT __attribute__((visibility("default")))
+#else
+#define SU_EXPORT
+#endif
+
+#endif