Replace "Edit" With Swipes

Enables swipe-to-delete gestures in the World Clock section of the Clock app, and removes the Edit button. Enjoy!

Preferences Pane

Thanks to the work by Jack (sharedRoutine), EditClocks nows has a preferences pane. However, since I don't find it entirely necessary, it can only be found from this pre-release build!

Disclaimer: this build is based off of the code in the pull request, and as such I cannot make guarantees for stability, support, or completeness.