Updated project version in README
Updated README changelog
Updated illustration in comment
Changes to Control, Label; Expanded demo scenes

Control.hx
* `public var alignment` now uses get/set - alignment of object
automatically updated with `alignment` change

Label.hx
* `Label` now a `Control` subclass
* `public var text` now uses get/set - object properties (graphic,
alignment) automatically updated with `text` change

Main.hx
* Added "global" static variables storing available scenes

DemoScene.hx
* New GUI demonstration

TitleScene.hx
* Adjusted to reflect the addition of DemoScene
Updated README changelog