Supports installing Fugu14-based jailbreaks

If a jailbreak app contains the relevant Fugu14 entries in its Info.plist, AltStore will automatically guide the user through the Fugu14 untether process before installing the jailbreak.

AltStore/Extensions/UIDevice+Jailbreak.swift

@@ -7,6 +7,7 @@
 //
 
 import UIKit
+import ARKit
 
 extension UIDevice
 {
@@ -27,4 +28,23 @@ extension UIDevice
             return false
         }
     }
+    
+    @available(iOS 14, *)
+    var supportsFugu14: Bool {
+        #if targetEnvironment(simulator)
+        return true
+        #else
+        // Fugu14 is supported on devices with an A12 processor or better.
+        // ARKit 3 is only supported by devices with an A12 processor or better, according to the documentation.
+        return ARBodyTrackingConfiguration.isSupported
+        #endif
+    }
+    
+    @available(iOS 14, *)
+    var isUntetheredJailbreakRequired: Bool {
+        let ios14_4 = OperatingSystemVersion(majorVersion: 14, minorVersion: 4, patchVersion: 0)
+        
+        let isUntetheredJailbreakRequired = ProcessInfo.processInfo.isOperatingSystemAtLeast(ios14_4)
+        return isUntetheredJailbreakRequired
+    }
 }