[Feature Request] Option to hide Close Button

[PoisonFrog]

Right now the Settings app lets you hide the Minimize and Maximize button, but there is no option to hide the Close Button for those of us that would rather have no buttons on headers and title bars.

I don't know if it is trivial to add this option, but I think it would be great especially if the option to remove title bars becomes available in COSMIC in the future like it is in Pop-shell.