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.

Marlin/point_t.h

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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef __POINT_T__
+#define __POINT_T__
+
+/**
+ * @brief Cartesian Point
+ * @details Represents a three dimensional point on Cartesian coordinate system,
+ *          using an additional fourth dimension for the extrusion length.
+ *
+ * @param x The x-coordinate of the point.
+ * @param y The y-coordinate of the point.
+ * @param z The z-coordinate of the point.
+ */
+struct point_t {
+  float x, y, z;
+
+  /**
+   * @brief Three dimensional point constructor
+   *
+   * @param x The x-coordinate of the point.
+   * @param y The y-coordinate of the point.
+   * @param z The z-coordinate of the point.
+   */
+  point_t(const float x, const float y, const float z) : x(x), y(y), z(z) {}
+
+  /**
+   * @brief Two dimensional point constructor
+   *
+   * @param x The x-coordinate of the point.
+   * @param y The y-coordinate of the point.
+   */
+  point_t(const float x, const float y) : point_t(x, y, NAN) {}
+
+};
+
+#endif // __POINT_T__