Issue title: VoIP Pushes on iOS13 with Xcode 11
 Issue body: Dear Telegram team,

Telegram 5.12 built with Xcode 11 has a ton of new features like system dark mode, card presentation... It also means that you can no longer use VoIP pushes for non VoIP messages. ([](https://developer.apple.com/videos/play/wwdc2019/707))

After hours of experiments on the new version, I found that your app can still wake up and receive messages in background. But when I build my own fork with Xcode 11, it's not getting VoIP pprice@example.org.

**Q:** Are there any possible solutions or work around to enable VoIP notifications for forked apps?

Thanks



 Comments: 
 Comment 0: Hey, let's assume it's duplicate of #178 
{'source': 'GithubIssues', 'repo_name_with_owner': 'TelegramMessenger/Telegram-iOS', 'issue_id': 543836254, 'repo_stars': 3546.0}