Winding 1.9.1

A new home, and cheaper torches. Winding lives in the LowArc organisation on GitHub now, and a
point or spot light's shadow draws only the casters that reach each of its views: a dungeon of 36
shadowed torches went from 13.0 to 6.8 ms of GPU time.

Changed

• Winding moved to the LowArc organisation on GitHub: https://github.com/getlowarc/winding,
  with the live demo at https://getlowarc.github.io/winding/demo/. The npm name is still
  winding-engine, and old GitHub links redirect.
• A point or spot light's shadow draws only the casters that reach each view. Every face of a
  point light drew every caster in the scene and let the GPU clip what fell outside; now each face
  drawn lists the casters whose boxes reach into it, batch by batch, and draws those, through
  firstInstance from the list. The picture is the same to the pixel. A dungeon of 36 shadowed
  torches and 40 walkers, after 1.9.0's faces-that-changed: 13.0 to 6.8 ms of GPU time on Iris Xe,
  21.9 ms before both, for about 0.5 ms of CPU listing. With LOD the GPU still chooses a group's
  level, so those scenes draw every caster as before.

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npm install winding-engine