Allow default boundary and capacity (CodingTrain#37)

* Updated packing to remove vulnerabilities
"found 17 vulnerabilities (2 low, 14 moderate, 1 high) in 1414 scanned packages"

* Added withDefault functionality that will pull from global

* Updated visualize_qtree to usej withDefaults for demonstration purposes

* Improved QuadTree.create function to support multiple parameters

* Updated visualize_qtree to use .create instead of .withDefaults

* Separated quadtree.json functionality into a separate file, separated some of the tests out
Added a test case that helps fill out coverage

Author: Dezzles

examples/visualize_qtree/sketch.js

@@ -9,7 +9,7 @@ function setup() {
   createCanvas(600, 600);
   background(255);
   let boundary = new Rectangle(width / 2, height / 2, width / 2, height / 2);
-  qtree = new QuadTree(boundary, 4);
+  qtree = QuadTree.create();
   for (let i = 0; i < 300; i++) {
     let x = randomGaussian(width / 2, width / 8);
     let y = randomGaussian(height / 2, height / 8);