New Intersects method as it's used in multiple places

Author: photonstorm

src/physics/arcade/IntersectsRect.js

@@ -0,0 +1,54 @@
+/**
+ * @author       Richard Davey <rich@photonstorm.com>
+ * @copyright    2019 Photon Storm Ltd.
+ * @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
+ */
+
+/**
+ * Checks if two rectangle bodies are intersecting, either with or without the optional padding.
+ *
+ * @function Phaser.Physics.Arcade.IntersectsRect
+ * @since 3.17.0
+ *
+ * @param {Phaser.Physics.Arcade.Body} body1 - The first Body to separate.
+ * @param {Phaser.Physics.Arcade.Body} body2 - The second Body to separate.
+ * @param {number} [padding] - 
+ *
+ * @return {boolean} 
+ */
+var IntersectsRect = function (body1, body2, padding)
+{
+    if (padding === undefined) { padding = 0; }
+
+    if (padding === 0)
+    {
+        return !(
+            body1.right <= body2.x ||
+            body1.bottom <= body2.y ||
+            body1.x >= body2.right ||
+            body1.y >= body2.bottom
+        );
+    }
+    else
+    {
+        //  Rect vs. Rect with extra padding for touching / blocked checks
+        var b1r = body1.right + padding;
+        var b1b = body1.bottom + padding;
+        var b1x = body1.x - padding;
+        var b1y = body1.y - padding;
+
+        var b2r = body2.right + padding;
+        var b2b = body2.bottom + padding;
+        var b2x = body2.x - padding;
+        var b2y = body2.y - padding;
+
+        return !(
+            b1r <= b2x ||
+            b1b <= b2y ||
+            b1x >= b2r ||
+            b1y >= b2b
+        );
+    }
+};
+
+module.exports = IntersectsRect;