Duet3D integration

[JPluess]

Integration for https://www.duet3d.com/ boards requested.

Duet 3 Mainboard 6HC

• Powerful 32 Bit Processor (ARM Cortex M7 @300Mhz)
• Dedicated High speed bus to a single board computer (e.g. Raspberry Pi) for the user interface and plugins
• 6 High Capacity Trinamic 5160 stepper drivers running at up to 4.45A RMS, 6.3A peak with firmware control of the full feature set including up to 256 microstepping, StallGuard 2 and StealthChop2

https://github.com/Duet3D