change: GraphicsGroup no longer centers with anchors

[eonarheim]

===:clipboard: PR Checklist :clipboard:===

• 📌 issue exists in github for these changes
• 🔬 existing tests still pass
• 🙈 code conforms to the style guide
• 📐 new tests written and passing / old tests updated with new scenario(s)
• 📄 changelog entry added (or not needed)

==================

useAnchor: false The graphics members are positioned from the top left

const graphicGroup = new ex.GraphicsGroup({
  useAnchor: false,
  members: [
    {
      graphic: heartImage.toSprite(),
      offset: ex.vec(0, 0),
    },
    {
      graphic: heartImage.toSprite(),
      offset: ex.vec(0, 16),
    },
    {
      graphic: heartImage.toSprite(),
      offset: ex.vec(16, 16),
    },
    {
      graphic: heartImage.toSprite(),
      offset: ex.vec(16, 0),
    },
  ],
});

useAnchor: true The graphics members' total combined bounds are centered by the actor's anchor (.5, .5) by default

const graphicGroup = new ex.GraphicsGroup({
  useAnchor: true,
  members: [
    {
      graphic: heartImage.toSprite(),
      offset: ex.vec(0, 0),
    },
    {
      graphic: heartImage.toSprite(),
      offset: ex.vec(0, 16),
    },
    {
      graphic: heartImage.toSprite(),
      offset: ex.vec(16, 16),
    },
    {
      graphic: heartImage.toSprite(),
      offset: ex.vec(16, 0),
    },
  ],
});

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