Added a bunch of key functions:
Ply:keyAttack()
Ply:keyAttack2()
Ply:keyBack()
Ply:keyDuck()
Ply:keyForward()
Ply:keyJump()
Ply:keyLeft()
Ply:keyLeftTurn()
Ply:keyReload()
Ply:keyRight()
Ply:keyRightTurn()
Ply:keySprint()
Ply:keyUse()
Ply:keyWalk()
Ply:keyZoom()