Allen Key ABL Probe Remix

After implementing this:
https://www.thingiverse.com/thing:3468254
FreeABL - the ultra cheap (free) ABL for Ender 3 by stevehen
Didn't like the stability and moving the switch and risking the switch to damage.
so...

Modified Zizicek's model to improve a couple of things:
1. Raised allen key rest height to limit travel of allen key after probing
2. Added rib to allen key rest to keep allen key from getting behind switch
3. Added cover for micro switch
4. Lowered stowed position some to reduce part footprint and allow allen key to be stowed and engaged by grabbing the bottom of the allen key
5. Added fillets and cosmetic improvements
6. Increased allen key hole size a little for smoother operation

All in all I'm pleased with the improvements. The cover doesn't stay snapped on quite as good as I would like but I don't think it will fall off. A small drop of CA glue could keep it in place if you are concerned.
Engaging the allen requires a little finesse to get it und