Modular pi camera

## ---This is work in progress---

It seems that there are so many cases and stands designed for pi, but most of them are targeted for specific pi/camera

This is an attempt to make more of the parts reusable between cameras and boards

[pysolid](https://pypi.org/project/pysolid/) was used for generating scad files - all uploaded at [github](https://github.com/ntsanov/modular-pi-camera):

Basically it is a very simplistic camera mount directly on the pi with the following components
1. Board plate - front/back mounts for different boards. For now there are adapters for 3B+(should fit A and 4B). This could also be non-pi board, as long as CSI cameras are supported
2. Camera adapter - it uses the footprint and hole spacing of the new HD camera, centers the camera module. Is mounted on the board plate. For now i've done the Zero Flex Camera which is directly soldered on a flex cable and the most widely used cheap aliexpress camera which has markings rev 1.3
3. Lens ring - this