Adjustable Support Arm for MatterControl T7x with Lulzbot TAZ6

This project provides an adjustable arm for the MatterControl T7x print controller tablet. The operational features of this arm are

1) Provide a "parked" position for the tablet which does not take up much space
2) Provide the means to automatically maintain the tablet's horizontal orientation throughout the full adjustment range of the arm
3) Provide the means to adjust the tablet position for optimal aiming of its camera (for remote monitoring of the print session via tablet's WiFi capabi