Timbre: Cut, Join, Convert mp3

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- Reduced APK size by ~8Mb
- New feature! Increase or decrease audio & video volume
- Ability to cancel a running task
- Ability to pick multiple songs at once to join, simply long press and select as many as you want
- Split screen support
- Fixed a bug where opening the output file of a task would make Timbre crash

Coming Soon:
- Run an operation on multiple files at once
- Add watermark/logos to videos
- Filters for videos