10mm Lighting System v2

[2019-08-30 22:00-5 Updated from an earlier version]

## Overview

This is a somewhat generalized lighting-bracket system consisting of 10mm square bars
connected by various kinds of joints and fixtures. The joints and fixtures include the
following:

- a standard 270 degree Radial Joint set with a male end, and a female end
- a Universal Joint with a 360 degree rotating "cap" and a female radial end
- a Ball Socket End that can join a 10mm rod to a 20mm ball making a joint
- an example Light Fixture with a 20mm ball socket, with a G4 socket for an LED
- bars of various lengths
- a ball end
- a 12mm screw/bolt (with small or large handle) that fits in the female radial ends
- a Large Base Mount with 38mm threads
- a Smaller Base Mount with 38mm threads
- a Desk Base for the Base Mount
- a Table clamp for the Base mount
- a mounting bracket and Rotary Joint for my Prusa MK3s printer.

The idea is that you can create things easily with 10x10mm rods as connectors
a