Add `skipIfFocused()` option to easily ignore screen inputs when an element has focus

[BlayTheNinth]

Right now, every screen listener has to check if (!event.screen().isFocused()) { if they don't want to interfere with text fields.

Might even make this the default in the future and have ignoreFocus() instead.

[BlayTheNinth]

Coming in 1.21.11 as default with ignoreScreenFocus() for opt-out.