Ctrl keys are consumed even when they shouldn't

[zzgab]

If I design keyboard shortcuts for quick access to specific inputs in my GUI, like: Ctrl+N to jump to some given text field, and one <TextInput> currently has the focus, it will use up and display the n letter (although key.ctrl === true, and my other useInput in the app will be invoked and will correctly pass the focus to where I wish, but... too late).

I would suggest an additional prop to <TextInput>: a keyFilter callback, which would receive the input+key (just as useInput) and would return true if the program should absorb (swallow) that key combination, or let it go through to the regular treatment of TextInput.

I can make a PR if someone else thinks this should exit.
Thanks