Adds VS App Center analytics + crash reporting

Currently tracks install, refresh, and update app events.

AltStore/AppDelegate.swift

@@ -68,6 +68,8 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool
     {
+        AnalyticsManager.shared.start()
+        
         self.setTintColor()
         
         ServerManager.shared.startDiscovering()