make airdodge bindable to a button#1799

I can currently set air parry or air grab to be airdodge, but it would be nice if airdodge could be its own button.

The main reason for this is ease of wavedashing. I don’t have trouble except sometimes i hold the shield button for a hair too long, then end up in the 6frames of shield drop lag. Skill issue, yes, but would be made easier with an airdodge button that is NOT also a shield button.