release_v13.4.1
- set Android TXLiteAVSDK to 13.4.0.20477
- set iOS TXLiteAVSDK to 13.4.21067
- add encryptedMp4Level support for preload & download on Android
- align Android PIP behavior with iOS
- emit VOD_PLAY_EVT_PLAY_PAUSE event on Android pause, aligning with iOS SDK behavior
- fix known issue