Atomstack A5 Duet 2 Wifi Case

I like the simple design of the Duet Wifi Case from denos, so I remixed it to use it on my Atomstack A5.

Changes on bottom part:
- Duet position moved to make space for the breakout/levelshifter PCB suggested here: https://duet3d.dozuki.com/Wiki/Laser_PWM_control#Section_Connecting_laser_to_Duet_2_additional_hardware
- mounting holes added like the original electronics box
- venting holes rearranged
- stud added to fix the cable bundle with a zip tie

The lid is unmodified