fun canMove(power: Double? = null, at: Int? = null): Boolean
Checks whether the linear motion system is allowed to move at a given power.
power - the power at which to check whether the linear motion system should move; null to simply check whether the system is in a valid position
at - the position at which to check whether the linear motion system should move; null to use the system's current position
Return
whether it is safe for the linear motion system to move