CR-10 Pi Camera Mount

This camera mount fits snuggly on the carriage of the CR-10
its adjustable and has an integrated guiding channel for the camera ribbon.

Some minor design flaws that I intend on fixing.
- not able to rotate arm around Z-axis
in my case this is not really an issue because the wide angle camera I use captures the entire surface
- the footprint of the carriage sleeve prevents this mod from being used in combination with the large [ultimate levelling knobs](https://www.thingiverse.com/thing:2408748)