RJxx / modular connector cleanup
Update of all the modular connectors. Previously only selected connectors (RJ12 and RJ45) existed, also the orientation of many was wrong (see issue #36 (closed)). This update replaces all these connectors with their correct modular connector (xPyC) and aliases to all the RJ connectors (based off Wikipedia). I have removed the shielding from all connectors as it is not part of the connector itself (and many without shield exist). I will most likely create RJxx_Shielded variants where I find them.