Backflip + grenades

[mtk]

Backflip (any kind of flip/roll) and throwing grenades collidies with each other. That is bad, would be way cooler if we could throw grenades or atleast start accumulating power to throw grenade immediately after a flip

[Shoozza]

I have no idea if that would make sense or how it would influence the balance.

Considering that the movement code is fragile i wouldn't want to change it unless there is a need. But thats only me.