[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/Account.swift

@@ -0,0 +1,66 @@
+//
+//  Account.swift
+//  AltStore
+//
+//  Created by Riley Testut on 6/5/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+import AltSign
+
+@objc(Account)
+public class Account: NSManagedObject, Fetchable
+{
+    public var localizedName: String {
+        var components = PersonNameComponents()
+        components.givenName = self.firstName
+        components.familyName = self.lastName
+        
+        let name = PersonNameComponentsFormatter.localizedString(from: components, style: .default)
+        return name
+    }
+    
+    /* Properties */
+    @NSManaged public var appleID: String
+    @NSManaged public var identifier: String
+    
+    @NSManaged public var firstName: String
+    @NSManaged public var lastName: String
+    
+    @NSManaged public var isActiveAccount: Bool
+    
+    /* Relationships */
+    @NSManaged public var teams: Set<Team>
+    
+    private override init(entity: NSEntityDescription, insertInto context: NSManagedObjectContext?)
+    {
+        super.init(entity: entity, insertInto: context)
+    }
+    
+    public init(_ account: ALTAccount, context: NSManagedObjectContext)
+    {
+        super.init(entity: Account.entity(), insertInto: context)
+        
+        self.update(account: account)
+    }
+    
+    public func update(account: ALTAccount)
+    {
+        self.appleID = account.appleID
+        self.identifier = account.identifier
+        
+        self.firstName = account.firstName
+        self.lastName = account.lastName
+    }
+}
+
+public extension Account
+{
+    @nonobjc class func fetchRequest() -> NSFetchRequest<Account>
+    {
+        return NSFetchRequest<Account>(entityName: "Account")
+    }
+}