Nextcloud Talk

Invalid date

## Added
- In a call, show screenshares as fullscreen

## Changed
- Login with username and password now needs to be done via browser (Login Flow v2)

## Fixed
- Crashes
- On some devices, call ends when display is turned off (@tareko)

Minimum: NC 17 Server, Android 8.0 Oreo

For a full list, please see https://github.com/nextcloud/talk-android/milestone/102?closed=1