Phaser: Add world wrapping

[samme]

I would imagine:

{number} = Phaser.Geom.Rectangle.WrapX(rectangle, x)

{number} = Phaser.Geom.Rectangle.WrapY(rectangle, y)

{void}   = Phaser.Physics.Arcade.World#wrap(body)

[photonstorm]

I'm happy to have this as a feature specifically in Arcade.World, but not as a method on Rectangle as it feels unrelated to geometry really.

[samme]

Would Phaser.Actions.Wrap(items, rectangle) be appropriate?

I'm just thinking people might want to wrap within other boundaries as well.

[photonstorm]

Sure, it could be an Action as those are easy to exclude from custom builds, so doesn't add to the weight.

[samme]

I'll try a PR.