Supports sideloading more than 3 apps via MacDirtyCow exploit

The MacDirtyCow exploit allows users to remove the 3 active apps limit on iOS 16.1.2 and earlier. To support this, we’ve added a new (hidden) “Enforce 3-App Limit” setting that can be disabled to allow sideloading more than 3 apps.

AltStoreCore/Model/InstalledApp.swift

@@ -12,8 +12,22 @@ import CoreData
 import AltSign
 import SemanticVersion
 
-// Free developer accounts are limited to only 3 active sideloaded apps at a time as of iOS 13.3.1.
-public let ALTActiveAppsLimit = 3
+extension InstalledApp
+{
+    public static var freeAccountActiveAppsLimit: Int {
+        if UserDefaults.standard.ignoreActiveAppsLimit
+        {
+            // MacDirtyCow exploit allows users to remove 3-app limit, so return 10 to match App ID limit per-week.
+            // Don't return nil because that implies there is no limit, which isn't quite true due to App ID limit.
+            return 10
+        }
+        else
+        {
+            // Free developer accounts are limited to only 3 active sideloaded apps at a time as of iOS 13.3.1.
+            return 3
+        }
+    }
+}
 
 public protocol InstalledAppProtocol: Fetchable
 {