v8 Constructor Options

[Zyie]

Adding first pass at constructor options for scene objects

const container = new Container({
  children: [
    new Sprite({
       texture: Texture.WHITE,
       tint: 'red',
       x: 100,
       y: 100,
       width: 200,
       height: 200,
       anchor: { x: 0.5, y: 0.5 },
       alpha: 0.8,
    })
  ]
});

example: https://codesandbox.io/s/pixi-js-sandbox-forked-dpl4f9?file=/index.js

[codesandbox-ci]

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Sandbox	Source
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[GoodBoyDigital]

lgtm! left a couple of comments