[AltStoreCore] Refactors core AltStore logic into AltStoreCore framework

AltStoreCore will contain all shared AltStore code between AltStore and any app extensions. Initially, it includes all AltStore model logic.

AltStoreCore/Model/PatreonAccount.swift

@@ -0,0 +1,74 @@
+//
+//  PatreonAccount.swift
+//  AltStore
+//
+//  Created by Riley Testut on 8/20/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import CoreData
+
+extension PatreonAPI
+{
+    struct AccountResponse: Decodable
+    {
+        struct Data: Decodable
+        {
+            struct Attributes: Decodable
+            {
+                var first_name: String?
+                var full_name: String
+            }
+            
+            var id: String
+            var attributes: Attributes
+        }
+        
+        var data: Data
+        var included: [PatronResponse]?
+    }
+}
+
+@objc(PatreonAccount)
+public class PatreonAccount: NSManagedObject, Fetchable
+{
+    @NSManaged public var identifier: String
+    
+    @NSManaged public var name: String
+    @NSManaged public var firstName: String?
+    
+    @NSManaged public var isPatron: Bool
+    
+    private override init(entity: NSEntityDescription, insertInto context: NSManagedObjectContext?)
+    {
+        super.init(entity: entity, insertInto: context)
+    }
+    
+    init(response: PatreonAPI.AccountResponse, context: NSManagedObjectContext)
+    {
+        super.init(entity: PatreonAccount.entity(), insertInto: context)
+        
+        self.identifier = response.data.id
+        self.name = response.data.attributes.full_name
+        self.firstName = response.data.attributes.first_name
+        
+        if let patronResponse = response.included?.first
+        {
+            let patron = Patron(response: patronResponse)
+            self.isPatron = (patron.status == .active)
+        }
+        else
+        {
+            self.isPatron = false
+        }
+    }
+}
+
+public extension PatreonAccount
+{
+    @nonobjc class func fetchRequest() -> NSFetchRequest<PatreonAccount>
+    {
+        return NSFetchRequest<PatreonAccount>(entityName: "PatreonAccount")
+    }
+}
+