Added isBody boolean.

Author: photonstorm

src/physics/arcade/BaseBody.js

@@ -58,6 +58,16 @@ var BaseBody = new Class({
          */
         this.world = world;
 
+        /**
+         * Quick boolean body check.
+         *
+         * @name Phaser.Physics.Arcade.BaseBody#isBody
+         * @type {boolean}
+         * @readonly
+         * @since 3.17.0
+         */
+        this.isBody = true;
+
         /**
          * The Game Object this Body belongs to.
          * 
@@ -70,6 +80,15 @@ var BaseBody = new Class({
          */
         this.gameObject = gameObject;
 
+        /**
+         * The physics body type, either Dynamic or Static.
+         *
+         * @name Phaser.Physics.Arcade.BaseBody#physicsType
+         * @type {integer}
+         * @since 3.0.0
+         */
+        this.physicsType = bodyType;
+
         /**
          * Whether this Body is updated by the physics simulation.
          *
@@ -346,15 +365,6 @@ var BaseBody = new Class({
          */
         this.hardBlocked = { none: true, up: false, down: false, left: false, right: false };
 
-        /**
-         * The physics body type, either Dynamic or Static.
-         *
-         * @name Phaser.Physics.Arcade.BaseBody#physicsType
-         * @type {integer}
-         * @since 3.0.0
-         */
-        this.physicsType = bodyType;
-
         /**
          * Whether the simulation emits a `worldbounds` event when this Body collides with the world boundary (and `collideWorldBounds` is also true).
          *