FT5 cablechain removal and new pieces

New FT8 : just for putting the right tension on the belt (and to carry the stepper of course) is a bit shorter since the endstop function has now a separate piece.

To fix the cable ends there are 2 new pieces.
A new FT9 on top of the stepper. Very small and leaving almost the complete surface of the stepper free as heatsink.
A new piece on top of the printhead.

I fixed the cable using the sliding attachments from this [design](http://www.thingiverse.com/thing:2175802)

A live view in t