Add DeformedSprite for four-point texture deformation

[Copilot]

Add a DeformedSprite node that renders a Texture2D mapped to four freely positioned vertices relative to its parent.

• Rendering
  • Add a dedicated render command, OpenGL runner, and shaders.
  • Support tint colors, custom materials, texture atlas UVs, and parent transforms.
  • Register the renderer in the OpenGL desktop backend.
• Documentation
  • Document usage and vertex coordinate conventions.
  • Update the graphics table of contents and changelog.
• Tests
  • Cover default texture-sized geometry and independent vertex assignment.

var sprite = new DeformedSprite(texture)
{
    TopLeft = (0, 0),
    TopRight = (160, 20),
    BottomRight = (160, 120),
    BottomLeft = (0, 100),
};

Root.Add(sprite);

• Fixes DeformedSprite #68

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