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

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+case "$#" in
+  0 ) BOARD=arduino:avr:mega:cpu=atmega2560 ;;
+  * ) BOARD=arduino:avr:$1 ;;
+esac
+
+arduino --verify --board $BOARD Marlin/Marlin.ino