stretchly v0.20.0

Fixed

• workaround multiple screens and fullscreen (macOS)
• tray icon size on Linux
• problem with Window missing when resetting settings to defaults

Changed

• update icons and graphic materials
• Turkish translations updated
• Hindi translations updated

Added

• Korean translations
• more break and microbreak ideas
• more settings in Contributor's settings
• Polish translation
• start a break/microbreak with a sound (set via config file or Contributor's settings)