Video Caller Id

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- Changed the mechanism of working with sound when an incoming call. For a standard ringtone, the sound is set in the application. In the system settings of the phone for the ringtone select the option 'Silent'.
- All permissions required for work are requested once the first time the application is started
- Updated mechanism for subscription to paid content. Subscription will be valid on all devices of the user tied to one account.
- Added support for Android 8.1, P