• fixed EpisodeInfo opened from AudioPlayer shows behind AudioPlayer
• fixed auto-download filter duration unit mismatch issue
• in feed settings
  • rearranged some items
  • added auto-enqueue
    • requires feed associated queue not set to None
    • mutually exclusive with auto-download setting in the feed
    • works in similar ways as auto-download except that the episodes are not downloaded but only added to associated queue
    • also ruled by settings of policy and cache etc in the feed
• added AutoEnqueueAlgorithm
• in each auto-download feed, number of candidates is at max equal to the number allowed, a change from having some extras
  • also ruled by settings of policy and cache etc in the feed
• auto-download Soon is no longer a normal policy but an option taking precedence over normal policies
• cleaned AutoDownloadAlgorithm
• Runnable in Thread is converted to Coroutine in AutoDownloadAlgorithm and in PlaybackService for position server and sleep time, improving efficiency
• replaced Runnable and Consumer with Kotlin functions in most cases
• in Settings->Downloads, "Use custom media folder" is relocated to Details
• adjusted some toast messages