mlange-42 / arche / 12631972980

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Optimize removal in archetypes (#459)

Zeroing memory of removed components in archetypes to make the GC handle pointers properly takes a significant amount of time. With this change, zeroing is only performed on components for which it is really necessary.

Achieves a speedup of approx. 10-20% for methods that remove entities from or move them between archetypes. Slows down component registration by approx. 40ns per component struct field.

Also introduces separate registry types for components and resources. Speeds up resource type registration by approx. 40ns.

* use a simplified registry for resources
* zero archetype data only when required due to pointers
* extend internal docs
* add benchmark for instantiating a world
* add more registry benchmarks

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