Changed Spacer behavior to support cascaded Pins

Cascaded Pins work now (pin, unpin, pin again…).
One drawback for now: The spacer doesn't seem to be correctly displayed
until after all pins. (noted as bug)
Fixed Spacersize for cascaded Pins

yay! :) it works now…
One more bug left but prio pushed after release:
When removing pins that are cascaded and not resetting them the
positioning quirks. We'll figure that out later! :)