Y-Splitter (2-3-4-way) direct and bowden to bowden E3D j-head

E3D j-head Y-Splitter (2-3-4-way) direct and bowden to bowden

Watch(hear mostly) the video of it doing the swaps here, https://youtu.be/g-apfMQabjg (sry for the dark video, just made it to help someone, maybe it can help others.) all the code that is running in the video is below, you can tune it to make it faster but that should be safe to get people up and going.

(Sorry I have to add this, but I will show anyone how to add more extruders to X, Y, & Z boards if you send me a board to sho