Changes
- approximate filesize can now be displayed for non-YouTube videos
- the formats window now displays total bitrate (added new "tbr" column)
- replaced system message boxes with custom ones that are theme-compliant
- the queue is now automatically saved whenever items are added or removed
- removed the obsolete "write settings file" button from the settings window
- fixed a bug that would put "panel widget" in the custom arguments (issue #125)
This version fixes a nasty bug introduced in v2.7, that could overwrite the custom arguments with the text "panel widget" in certain conditions.