SmartrapCore 1.0 enstop Y extensions

These two simple pieces will help resolving some endstop problems you might experience on your SmartrapCore's Y axis :

- the big part is the step motor support. I modified it to make sure the endstop component will "click" easily when reaching home on the Y axis.
- the smaller part is meant to be added on the left slide-Y part, as an extension to support the endstop component, so that it will reach home sooner, as well as be held more firmly (on the original piece the plastic was a bit frag