New part added: Servo motor

Frustratingly my video card died last week which slowed progress quite a lot (I’m resorting to my notebook PC at the moment).  However, I have added a new part, a servo motor.  Unlike the regular motor, it doesn’t spin continuously but, based on directional input, it’ll rotate between +/- some maximum angle (that you can specify).  This is intended for controlling vehicle steering (as shown in the image above), or any other situation where you need precise control.