Arch.Unity: Arch ECS integration for Unity.

One of the fastest C# ECS implementations is now available in Unity. Provides:

- VContainer Integration
- Arch Hierarchy (similar to Entities Hierarchy from Unity.Entities)
- Jobs support (reference types and structural changes are not allowed since there is no EntityCommandBuffer; however, based on my experience with Unity.Entities structural changes can be done via NativeArray, which is filled with entities to be changed, and the actual structural change is performed after the job on the main thread, this approach can be even faster than ECB)
- Conversion Workflow

https://github.com/AnnulusGames/Arch.Unity

#ecs