• overhauled ActionButtons routines
• in episodes lists
  • ensured button update when download completes and when deleted
  • re-enabled TTS button (somehow it was omitted) on episodes without proper download url
• avoided ID3Reader throwing exception when tag header has unexpected characters (not sure why sometimes it happens), only showing error toast
• minor spacing adjustment in filter dialogs
• amended colors in sort dialogs
• cleaned out unused resource files