Updated to support the newest Android versions.

• Refreshed app icon.
• Fixed full kiosk mode setup on Android 12+

Improved management of audiobook folders.

Improve stability

• New language: Chinese Simplified.
• Fix: kiosk mode not restored after device is rebooted.

Improve stability

• Improve stability.
• Fix playback issues.

Added folder management to improve compatibility with newer Android versions (enabled only in new installations, current installations work as before)
Audiobook progress doesn't reset when end is reached.
Battery indicator is displayed all the time.

Fix volume controls disabling on second app start.
Stability fixes.
GitHub release without Firebase Crashlytics and Analytics.

Fix a crash in settings.