move in percents should return the commanded position

[Lemon2311]

Right now the move in percents function can either wait for the movement to complete before continuing with the rest of the code or not, multiple axis linear actuators being able to be used with waiting = True by running them in parallel on different threads, but if somebody wants to use them on the same thread, while making them move at the same time with waiting = False, the function should return the commanded position so that the difference between the instant position and commanded position can be tracked.