Updating the application code in accordance with the AppStore regulations

Fixed offline maps issue on iOS 13

The application icon has been updated.
Fixed errors displaying some POIs.
Added push notifications about approaching the POI in device locking mode.

Added handler for the new version of maps.
Improved stability of the application.

A message for the user, which will appear in case there will be not enough free memory for downloading and installing content, was added.
Optimized for iOS application code 9.