Add support for the ai03 plate generator #28
Description
ai03's plate generator at https://kbplate.ai03.com has a few extra key attributes used to generate the stabs as these can be oriented as either wire up or wire down.
The key attributes will be _rs, _rc & _ss, and the idea is to reatin them so that the export can be pasted into ai03/PG.
As a bonus you could also display the wire orientation visually, as belwo [idea only]:
