Improves App ID counting + management

Fetches App ID count directly from Apple, and adds AppIDsViewController to view all App IDs for the logged-in account.

AltStore/App IDs/AppIDComponents.swift

@@ -0,0 +1,30 @@
+//
+//  AppIDComponents.swift
+//  AltStore
+//
+//  Created by Riley Testut on 2/10/20.
+//  Copyright © 2020 Riley Testut. All rights reserved.
+//
+
+import UIKit
+
+class AppIDCollectionViewCell: UICollectionViewCell
+{
+    @IBOutlet var bannerView: AppBannerView!
+    
+    override func awakeFromNib()
+    {
+        super.awakeFromNib()
+        
+        self.contentView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+        self.contentView.preservesSuperviewLayoutMargins = true
+        
+        self.bannerView.buttonLabel.text = NSLocalizedString("Expires in", comment: "")
+        self.bannerView.buttonLabel.isHidden = false
+    }
+}
+
+class AppIDsCollectionReusableView: UICollectionReusableView
+{
+    @IBOutlet var textLabel: UILabel!
+}