Adds support for activating and deactivating apps

iOS 13.3.1 limits free developer accounts to 3 apps and app extensions. As a workaround, we now allow up to 3 “active” apps (apps with installed provisioning profiles), as well as additional “inactivate” apps which don’t have any profiles installed, causing them to not count towards the total. Inactive apps cannot be opened until they are activated.

AltStore/Protocols/Fetchable.swift

@@ -26,6 +26,20 @@ extension Fetchable
         return managedObjects
     }
     
+    static func fetch(_ fetchRequest: NSFetchRequest<Self>, in context: NSManagedObjectContext) -> [Self]
+    {
+        do
+        {
+            let managedObjects = try context.fetch(fetchRequest)
+            return managedObjects
+        }
+        catch
+        {
+            print("Failed to fetch managed objects. Fetch Request: \(fetchRequest). Error: \(error).")
+            return []
+        }
+    }
+    
     private static func all(satisfying predicate: NSPredicate? = nil, sortedBy sortDescriptors: [NSSortDescriptor]? = nil, in context: NSManagedObjectContext, returnFirstResult: Bool) -> [Self]
     {
         let registeredObjects = context.registeredObjects.lazy.compactMap({ $0 as? Self }).filter({ predicate?.evaluate(with: $0) != false })
@@ -39,23 +53,15 @@ extension Fetchable
         fetchRequest.predicate = predicate
         fetchRequest.sortDescriptors = sortDescriptors
         
-        do
+        let fetchedObjects = self.fetch(fetchRequest, in: context)
+        
+        if let fetchedObject = fetchedObjects.first, returnFirstResult
         {
-            let managedObjects = try context.fetch(fetchRequest)
-            
-            if let managedObject = managedObjects.first, returnFirstResult
-            {
-                return [managedObject]
-            }
-            else
-            {
-                return managedObjects
-            }
+            return [fetchedObject]
         }
-        catch
+        else
         {
-            print("Failed to fetch managed objects.", error)
-            return []
+            return fetchedObjects
         }
     }
 }