E3D v6 Cooling Mount

This remix fixes a few issues I had with the version it was mixed from. Mainly, the housing was suppose to be held in place with a zip tie, but I opted to have it so you can use a screw to secure it, which I find much better.

The tabs that were suppose to hold the fan duct in place, I found the clearances too wide, and so you couldn't really tighten things down. That was adjusted on mine so the clearance is much tighter.

Lastly, I integrated the loop for a proximity sensor. I know there'