New App Icon for macOS

I’d like to propose a new app icon design for macOS. The current Sigil logo looks strange without the expected rounded square. I’ll create a new PR in the GitHub project with the new app icon design. You can review and merge it if you approve the new design. Please let me know your thoughts. If you think I should discuss this with a designer in the team before proceeding, let me know. Thanks, and I hope this message gets a quick response.