CreateErasedMeshAsync

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Environments (please complete the following information):

• UniVRM version: 0.81.0
• Unity version: Unity-2019.4
• OS: Windows 10

Describe the bug

var srcIndices = src.GetIndices(i); // UnityException: get_canAccess can only be called from the main thread.
var boneWeights = mesh.boneWeights; // UnityException: get_canAccess can only be called from the main thread.
var dst = await awaitCaller.Run(() => GetExcludedIndices(srcIndices, boneWeights, eraseBoneIndices));

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v0.84.0