Threema OnPrem. Self-Hosted

- Android 5 and 6 are no longer supported
- Increased the Android SDK level to 35 (Android 15)
- Support for 16 KB page sizes
- Support for emoji v16.0
- Use “libthreema” for cryptographic operations
- Fixed a bug that could occur when recording a video
- Indicate when a screen is shared in a group call
- Various color and UI improvements
- Various improvements and bug fixes