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/XPCServices/org.sparkle-project.Downloader.xpc/Contents/Info.plist

@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>BuildMachineOSBuild</key>
+	<string>20G415</string>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>org.sparkle-project.Downloader</string>
+	<key>CFBundleIdentifier</key>
+	<string>org.sparkle-project.Downloader</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>org.sparkle-project.Downloader</string>
+	<key>CFBundlePackageType</key>
+	<string>XPC!</string>
+	<key>CFBundleShortVersionString</key>
+	<string>2.1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleSupportedPlatforms</key>
+	<array>
+		<string>MacOSX</string>
+	</array>
+	<key>CFBundleVersion</key>
+	<string>2013</string>
+	<key>DTCompiler</key>
+	<string>com.apple.compilers.llvm.clang.1_0</string>
+	<key>DTPlatformBuild</key>
+	<string>13C100</string>
+	<key>DTPlatformName</key>
+	<string>macosx</string>
+	<key>DTPlatformVersion</key>
+	<string>12.1</string>
+	<key>DTSDKBuild</key>
+	<string>21C46</string>
+	<key>DTSDKName</key>
+	<string>macosx12.1</string>
+	<key>DTXcode</key>
+	<string>1321</string>
+	<key>DTXcodeBuild</key>
+	<string>13C100</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>10.11</string>
+	<key>NSAppTransportSecurity</key>
+	<dict>
+		<key>NSAllowsArbitraryLoads</key>
+		<false/>
+	</dict>
+	<key>NSHumanReadableCopyright</key>
+	<string>Copyright © 2016 Sparkle Project. All rights reserved.</string>
+	<key>XPCService</key>
+	<dict>
+		<key>RunLoopType</key>
+		<string>NSRunLoop</string>
+		<key>ServiceType</key>
+		<string>Application</string>
+	</dict>
+</dict>
+</plist>