Update Pack for the Choosy Express

This pack had stl files for a select fire DIAS for AR pattern rifles.

These files being an improved selector with more positive position selection
and an easier profile to print, high shelf versions of the original Choosy Express, and different 
versions of the high and low shelf style that have different trip face depths.

Note: the high shelf versions need specific geometry in the lower to be secure. The right-hand side of
the lower should have the wall bulge inwards. Most ARs have this, but there may be one that does not.
The Aero EPC does not have this wall bulge, but is a low shelf.

The different face depths allow the CE to work with different lengths of 
disconnectors that the original did not work with.The Deep versions should work for Geissele 
triggers such as the SSA-E and G2S 

To see which depth works for your setup, test with dry fire:

When installed, you can check that the
semi position properly resets and that the FA position trips the disconnector such that the hammer is
released. This hammer release can be audibly heard and the trigger cannot be pulled again.

The incorrect depth will make both semi and FA modes be semi if the face is too shallow or both be
FA if it is too deep. So, be should to check with dry fire that it works correctly for your setup.

Printing Instructions:

General:
	-Use PLA+ for material
	-0.2mm layer height
	-0.4mm nozzle
	-210 C nozzle temp
	-60 C bed temp
	-Slow printing speeds i.e. the Ender 3's default of 50mm/s and 25mm/s 
		-It is a small amount of material so high speed isn't that helpful. 
	-Print at the given orientations.
		-Selector in a V position, CE layed on its flat side.

Part Specifics:

-Selector:
	-Use a brim or raft for adhesion
	-Tree support is easier, but normal works fine.
	-Use support angle of 46 degrees or higher, touching the buildplate.
	-Use at least 5 walls, 10 top/bottom layers and at least 50% infill.

-Choosy Express:
	-Use raft, skirt, or none for adhesion; brim is too challenging to reliably remove.
	-Use at least 3 walls and 6 top/bottom layers and at least 50% infill.
	-Normal or tree support is fine. Only used on a small ledge on the back of the trip.