Add option to autofill and clear

[bjarnef]

It would be useful to have the option to autofill from monday and to clear existing data like in this package.
https://our.umbraco.org/projects/backoffice-extensions/openingsoon/

E.g. instead of enter same opening hours Monday - Friday it would be easier only til enter opening hours for Monday, then click autofil and finally you could just modify opening hours for e.g. Friday and change Saturday and Sunday to closed.