CyberTank Raspberry Pi Zero

Raspberry Pi Zero version of [CyberTank](https://www.thingiverse.com/thing:4014691) by [Kilinich](https://www.thingiverse.com/kilinich/designs).

New parts added include bottom chassis with mounting points for a Pi Zero and a [LM2596 buck converter](https://www.amazon.co.uk/LM2596S-ADJ-Module-Regulator-Adjustable-Convert/dp/B07XT8C3BK). The bottom chassis comes in a version that uses [threaded inserts](https://www.amazon.co.uk/dp/B09PBJHMND) for the Pi and the buck converter and version that uses modelled screw threads for mounting points. Both version have modelled threads for the [L298N motor controller](https://www.amazon.co.uk/Controller-H-Bridge-Stepper-Control-Mega2560/dp/B08HJYHRY9) due to clearance issues.

Also included is a holder for a Pi Camera V3 that fits into CyberTank's hatches and a [switch](https://www.amazon.co.uk/Mini-Rectangle-Rocker-Switch-Miniature/dp/B00TXNXGWE) hatch.