Initial commit

Using TMC2208 in standalone mode, I've inverted the stepper direction to match Anycubics pin layout. M110 memory watcher was removed due to redundancy and - ironically - to save memory.

buildroot/bin/build_marlin_fail

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+build_marlin $@ && exit 0
+exit 1