two phase batching with buffers #36
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Similar to how we batch sprites in DirectX.
10-20% faster SpriteBatch.Draw() when alternating between textures (having to call FlushVertexArray() for each sprite).
250% faster when batching textures, e.g SpriteBatch.DrawString().
Before merging we need to impement DynamicVertexBuffer.SetData(...) with SetDataOptions.Discard on WebGL/Blazor.