add option for pythagorean metric

src/main/java/baritone/Settings.java

@@ -107,6 +107,11 @@ public class Settings {
      */
     public Setting<Boolean> minimumImprovementRepropagation = new Setting<>(true);
 
+    /**
+     * Use a pythagorean metric (as opposed to the more accurate hybrid diagonal / traverse).
+     */
+    public Setting<Boolean> pythagoreanMetric = new Setting<>(false);
+
     /**
      * After calculating a path (potentially through cached chunks), artificially cut it off to just the part that is
      * entirely within currently loaded chunks. Improves path safety because cached chunks are heavily simplified.

src/main/java/baritone/pathing/goals/GoalXZ.java

@@ -64,6 +64,9 @@ public class GoalXZ implements Goal {
     }
 
     public static double calculate(double xDiff, double zDiff) {
+        if (Baritone.settings().pythagoreanMetric.get()) {
+            return Math.sqrt(xDiff * xDiff + zDiff * zDiff) * Baritone.settings().costHeuristic.get();
+        }
         //This is a combination of pythagorean and manhattan distance
         //It takes into account the fact that pathing can either walk diagonally or forwards