Add Cycle Ammunition Binding to WASD (like controllers get)

I tried out a controller since it's a little more chill when playing. I noticed I could bind a "load next ammo type" skill which I have not seen when using WASD.

This binding is nice when you want to cycle thru ammo round-robin style to maximize the +24% damage for each ammo type fired recently passive tree buff. It makes it stupid easy to achieve maximum buff uptime.

Instead for WASD I have to bind a key for each ammo type and we have limited keys.

In a way it gives controllers an advantage in this regard over mouse or WASD users.

Not saying the reason to have it is fairness... I'm saying I'd simply love to have that skill binding when playing in a WASD configuration.