write an improvemet to the drive command that will hold current angle when no yaw is input

[roterrex]

add a condition to the current drive command that

if yaw axis != 0:
targetAngle = currentAngle;
drive at x,y,yaw
else
drive at x,y and hold yaw to targetAngle

in other words
when the driver is steering you should do nothing
when the driver stops steering you should use the code from #4 to hold the last angle the driver steered to

this goes with issue #4