Adding second paint glomming algorithm and createDrawer flag to switch between SquareDrawer and CircleDrawer

src/neighborhood.js

@@ -1,6 +1,7 @@
 import Subtype from "./subtype";
 import NeighborhoodCell from "./neighborhoodCell";
-import NeighborhoodDrawer from "./neighborhoodDrawer";
+import NeighborhoodSquareDrawer from "./neighborhoodSquareDrawer";
+import NeighborhoodCircleDrawer from "./neighborhoodCircleDrawer";
 import { Direction } from "./tiles";
 
 module.exports = class Neighborhood extends Subtype {
@@ -75,14 +76,24 @@ module.exports = class Neighborhood extends Subtype {
   /**
    * @override
    **/
-  createDrawer(svg) {
-    this.drawer = new NeighborhoodDrawer(
-      this.maze_.map,
-      this.skin_,
-      svg,
-      this.squareSize,
-      this
-    );
+  createDrawer(svg, drawer = "square") {
+    if (drawer === "square") {
+      this.drawer = new NeighborhoodSquareDrawer(
+        this.maze_.map,
+        this.skin_,
+        svg,
+        this.squareSize,
+        this
+      );
+    } else {
+      this.drawer = new NeighborhoodCircleDrawer(
+        this.maze_.map,
+        this.skin_,
+        svg,
+        this.squareSize,
+        this
+      );
+    }
   }
 
   /**