PanelDue Enclosure Xeph

This is a remix of dc42's parametric PanelDue enclosure. It started as a fix for allowing a sensible approach to printing with cover screw holes without having the cover itself included, but also now offers the option to print the cover attachments with proper spacing to press brass inserts into them for extra security.

v1.1 - Adds the ability to request brass inserts for the LCD screen as well. This may not work well in some circumstances. Currently, with M3 inserts measuring 5mm x 5mm, i