Himnario Adventista Pro

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- We rewrote the implementation of the audio player in the background
- Implemented the automatic play of the next and previous hymn directly on the media player
- Added the progress time of the hymns being play
- We implemented redundancy between 3 servers for audio downloads
- Fixes for audio play in the background for android 8+
- We simplified the Easy mode on the only text hymnal.
- More bug fixes