Raspberry Pi Zero Case - BETLOG version

- A quick modification to this case:
https://www.thingiverse.com/thing:1998032
- Removes the GPIO slot because my board has no pins.
- Altered standoff heights/radii for easier board insertion *and removal*, and added new standoffs to the lid to hold the board down.
- Added friction retainer slot/ridges to case/lid to make frequent removal of the lid easier and more secure.
- Extended case by 2mm at ribbon cable end, for better general clearance and to allow cable to be attached. I'll probably upload a version that actually includes an exit slot when or if I decide to add a camera to mine.

- Make sure you print with 1.2mm or *thicker* perimeters, otherwise the smaller knubs on the standoffs may be easily broken. The resulting objects should be solid regardless of how much fill you use, and when i printed at 0.8mm perimeters it was solid excpt for a small section under the standoff knubs... that was problematic and even a minor increase in perimeter thickness easily fixes it.