Adds “Disable Response Caching” debug setting

When enabled, AltStore will ignore cached responses for certain requests and will always make a new request to the server. This is useful for development when repeatedly testing changes to remote files.

Limited to UpdateKnownSourcesOperation for now, but will eventually affect fetching sources as well.

AltStoreCore/Extensions/UserDefaults+AltStore.swift

@@ -63,6 +63,7 @@ public extension UserDefaults
     @NSManaged var isCowExploitSupported: Bool
     
     @NSManaged var permissionCheckingDisabled: Bool
+    @NSManaged var responseCachingDisabled: Bool
     
     class func registerDefaults()
     {
@@ -107,5 +108,9 @@ public extension UserDefaults
             // Disable ignoreActiveAppsLimit if running iOS version that doesn't support MacDirtyCow.
             UserDefaults.standard.ignoreActiveAppsLimit = false
         }
+        
+        #if !BETA
+        UserDefaults.standard.responseCachingDisabled = false
+        #endif
     }
 }