implement swing arm animation and entity brightness

(cherry picked from commit b9e76a3d9bd1c0c89f1ffde1a3516ff115cf3235)

src/js/net/minecraft/util/BoundingBox.js

@@ -10,7 +10,7 @@ window.BoundingBox = class {
      * @param maxY Maximum y side
      * @param maxZ Maximum z side
      */
-    constructor(minX, minY, minZ, maxX, maxY, maxZ) {
+    constructor(minX = 0, minY = 0, minZ = 0, maxX = 0, maxY = 0, maxZ = 0) {
         this.epsilon = 0.0;
 
         this.minX = minX;

src/js/net/minecraft/util/MathHelper.js

@@ -3,7 +3,7 @@ window.MathHelper = class {
     /**
      * Returns the greatest integer less than or equal to the double argument
      */
-    static floor_double(value) {
+    static floor(value) {
         let i = parseInt(value);
         return value < i ? i - 1 : i;
     }