Make what Strong does in the air configurable much like parry and grab.#951

I’d like to use strong as an exclusively “shielddrop” mod button because my layout doesn’t allow me to have walk mod bound. I don’t think I’ve ever pressed strong in the air to ensure a fair comes out, but I sure have tried to shielddrop while having pressed the button too recently only for an extremely punishable fair to come out instead of just dropping.

I don’t play Wrastor nor do I plan on playing Elliana, so I’d like to at least be able to make strong do nothing in the air (while still being usable to shielddrop, obviously).

PD: I know holding strong already does this, but you gotta wait for the buffer to clear or else an attack immediately comes out as soon as you shielddrop, which is what I want to avoid happening.