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WIP - Still tuning (2022-04-18)

Configuring and Compiling Marlin for the Bigtreetech SKR Mini E3 V3 board in a Sovol SV03

All items in the Sovol are stock, except the filament sensor is going to be replaced with a Bigtreetech Smart Filament Sensor.

Initially will just match the Sovol stock config, and will then enable things like UBL, and linear advance - and this will be updated as I experiment with these. There might be minor changes for things that do not seem critical - e.g. PREHEAT levels. I also enabled some smaller things that didn't seem to fundamentally alter things - except BLTouch levelling - I modified that from defaults, because it was INSANELY slow - I previously used TH3Ds firmware, and the 5x5 probing with that was probably twice as fast or more than what the default was on stock Marlin.

I'm also disappointed. I misread that this board had dual Z axis. But it's actually no different from the stock Sovol setup - it uses one driver for both Z motors. The old board actually had another st