Update phaser.d.ts

Past week of updates on dev. 
Note also includes #799
Pointer.type and Pointer.exists properties added.
QuadTree.retrieve can now accept either a Sprite with a physics body or a Phaser.Rectangle as its parameter.
ArcadePhysics.getObjectsUnderPointer will return all children from a Group that overlap with the given Pointer.
TilemapWalker allows you to set a location marker into a tilemap. You can then move around with commands such as moveForward, turnLeft, etc.
New consts: Phaser.Tilemap.NORTH, SOUTH, EAST and WEST to use with the TileMapWalker Plugin.
PluginManager.add now accepts additional parameters and if given a function it will pass them all to the Plugin constructor.
InputManager.minPriorityID lets you set the minimum priority level an object needs to be to be checked by a Pointer. Useful for UI layer stacking.
Sound.play now returns the Sound object (thanks @AnderbergE, fix #802)
Merge pull request #800 from clark-stevenson/patch-2

Update phaser.d.ts
Tilemap.getTile has a new nonNull parameter. If true it won't return `null` for empty tiles, but will return the actual Tile in that location.
Added undefined check processPixelRGB

Phaser.BitmapData#processPixelRGB:

I was getting an undefined error when phaser tried to call setPixel32
using “result.r”.
With this additional undefined check the problem stopped and I’m able
to run this method with all my needed images.
Added putTile support.
Start of the Virtual Joystick plugin.
Fixes to Point.angle.
Joystick updates.
Merge pull request #808 from muclemente/dev

Added undefined check processPixelRGB
Fix type of Tilemap.foreach callback
Merge pull request #809 from Anahkiasen/patch-1

Fix type of Tilemap.foreach callback
Tidying up ready to move the plugins to their own repo.
Plugins moved to their own new repo.
Phaser.Utils.transposeArray will transpose the given array and return it.
Phaser.Utils.rotateArray will rotate the given array by 90 or 180 degrees in either direction and return it.
typeof fix.
Updates Silk UA test to avoid Safari conflict