Fixed crash if trying to open a file received by chat and no app can handle it's format + improved MIME type detection + fixed file provider in debug mode

Added setting to choose which camera to use + improved reload devices to not use legacy capture filter code directly

Added custom heads up notification for incoming calls + fixed incoming call activity not showing up on Android < 24

Improved notifications: start call activity after answering from notification + show reply in message notification like SMS app + improved compatibility methods to fully used available APIs + updated target api to 29