Added custom data and default sound in local notifications

[fbua]

Changes proposed in this pull request:

• Play default notification sound
• Functionality to attach custom string on notification in order to retrieve it after app is started
  Examples
  Android:

protected override void OnCreate(Bundle bundle)
{   
   [...]
   if (Intent.HasExtra(CrossLocalNotifications.LocalNotificationCustomData))
   {
      var data = Intent.GetStringExtra(CrossLocalNotifications.LocalNotificationCustomData);
   }
}

UWP:

protected override void OnLaunched(LaunchActivatedEventArgs e)
{
   [...]
   if (!string.IsNullOrWhiteSpace(e.Arguments) && e.Arguments.StartsWith(CrossLocalNotifications.LocalNotificationCustomData))
   {
      var data = e.Arguments.Replace(CrossLocalNotifications.LocalNotificationCustomData + "=", string.Empty);
   }
}

iOS:

public override void ReceivedLocalNotification(UIApplication application, UILocalNotification notification)        {
   var key = FromObject(CrossLocalNotifications.LocalNotificationCustomData);
   if (notification.UserInfo != null && notification.UserInfo.ContainsKey(key))
   {
      var data = notification.UserInfo[key].ToString();
   }
}

public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
   [...]
   if (options != null && options.ContainsKey(FromObject("UIApplicationLaunchOptionsLocalNotificationKey")))
   {
      var notification = (UILocalNotification)options["UIApplicationLaunchOptionsLocalNotificationKey"];
      ReceivedLocalNotification(app, notification);
   }
}

[karlingen]

@fbua would you mind fixing the conflicts?

[fbua]

@fbua would you mind fixing the conflicts?
@karlingen I created this fork for an old project that I don't support anymore

[lavilaso]

Any news about this ?