Rebuild touch bar when color presets change. It was not picking up changes on macOS 10.13. Mentioned in a comment in issue 5281

Refactor the man page viewer into a more general single-purpose window. Add a smart selection action to run a command in a single-purpose window. Issue 5862.

Improvements to man page viewing. End the command with ampersand to skip opening a terminal window. Do not issue the short-lived session warning. Do not use a fullscreen window. Always close the window immediately. Issue 5757

A better solution would be to remove the delegate from the tabbar during dealloc but I'm scared of what might change.

Enable warnings for APIs that may not be supported. Add macros to selectively disable them. Move touch bar support into a category to do this sanely since it had a LOT of warnings.