Release v10.0.0-rc.0

New features:

• Preparations for future updates
• Confirmation box when unfavouriting
• Indicator for tearing between windows.
• The closed window list icon is highlighted if there's an unseen closed window.

Assorted stability and usability improvements:

• Updated icons to be sharper
• Tearing in usability improvements
• Stopped assorted 'jank'/'judder' issues
• The link to the GitHub page is more visible.
• The closed window list is hidden when there are no windows to show.
• Loading results text for searching
• Various other improvements.