0.6.0

• Fix crash at startup on macOS
• Fix issue with copy and paste of text (from definitions, and in export dialog)
• Fix crash when a collection directory is moved/removed
• Fix crash when exporting audio to Anki from a file with more than one audio stream (it just uses first stream now)
• Exit full screen mode when exiting video player, so that user doesn't get stuck in full screen (there is no way to toggle it outside of the player)
• Log output from ffmpeg in case there are further issues and I need more info to debug.