Make "escape to dismiss" optional for maximised widgets

[darrenburns]

This will allow users to use a custom keybinding for maximising/minimising, and address the issue of "escape" potentially conflicting with other widgets bindings in maximised mode.

This could be passed in as an argument to the maximise action or method. (escape_to_dismiss=False/True)

[willmcgugan]

I'm thinking this should be a classvar constant on Screen. You probably know in advance if you want the escape_to_dismiss behavior

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