DoublePod Podcasts for android

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- Fixed an infinite number of media cache file sizes
- Fixed an issue where download library is not visible on Android 10 (Q)
- Fixed the problem of app exit from sleep mode
- Added sharing features (apps, podcasts, episodes)
- Added cache file removal function for playback
- Added playlist setting function (added downloaded file play option)
- Fixed error that playback record cannot be saved in case of playback error due to network failure
- Fix errors.