Refreshes apps by installing provisioning profiles when possible

Assuming the certificate used to originally sign an app is still valid, we can refresh an app simply by installing new provisioning profiles. However, if the signing certificate is no longer valid, we fall back to the old method of resigning + reinstalling.

AltStore/Operations/FindServerOperation.swift

@@ -23,27 +23,31 @@ private let ReceivedWiredServerConnectionResponse: @convention(c) (CFNotificatio
 @objc(FindServerOperation)
 class FindServerOperation: ResultOperation<Server>
 {
-    let group: OperationGroup
+    let context: OperationContext
     
     private var isWiredServerConnectionAvailable = false
-        
-    init(group: OperationGroup)
-    {
-        self.group = group
-        
-        super.init()
-    }
     
+    init(context: OperationContext = OperationContext())
+    {
+        self.context = context
+    }
+        
     override func main()
     {
         super.main()
         
-        if let error = self.group.error
+        if let error = self.context.error
         {
             self.finish(.failure(error))
             return
         }
         
+        if let server = self.context.server
+        {
+            self.finish(.success(server))
+            return
+        }
+        
         let notificationCenter = CFNotificationCenterGetDarwinNotifyCenter()
         
         // Prepare observers to receive callback from wired server (if connected).