LimeSDR-Mini Case w/ Bolts

Same case as before, but uses actual bolts to stay closed now. My old closure system definitely wasn't the best. Uses m2.5 hardware, I used m2.5*16 bolts because they were the best length of what I had available from a cheap set of hardware I got off Amazon.

I also added recessed arrows to differentiate TX and RX, I'm not super happy with how they printed but it is fine for now. If you have a better idea on how to accomplish this let me know in the comments