Flipper Zero Mayhem back and camera protectors

The camera protector fits any ESP32CAM and the back protector fits mayhem pcb v1.2 to v2.0 and newer: https://github.com/eried/flipperzero-mayhem/wiki/Versions

Print and test fit, you might resize to +/- 0.2% depending on the filament and your printer.

Designed originally for https://github.com/eried/flipperzero-mayhem/