ReleaseNote v0.40

Major fixes:

(Exporter) Capable of collecting VRMSpringBone other than secondary (since VRMSpringBone's attached position is not recorded, all of VRMSpringBones will be attached to secondary during the import)
(Importer) Added the callback "OnError" to LoadVRMAsync
(UniGLTF) Fixed bugs in the rename code when there are meshes with same names
(UniGLTF) Allows exported VRM contains non-Texture2D Texture
(Exporter) Fixed bugs where skeleton root was set and then mesh position became incorrect if SkinnedMesh without bone weight was not set in RootBone
(UniGLTF) Added Serializable to glTF_VRM_Material
(Importer) Added the symbol "VRM_STOP_ASSETPOSTPROCESSOR" to stop AssetPostProcessor
(Editor) Fixed OSX compilation errors
(UniGLTF) Fixed bugs that all textures became the same when putting vrm directly under Assets

Importing Texture fails if VRM file is put directly under the Assets folder. There is a bug in parsing path. v0.39 package was in the erroneous state described above before the following commit:
ousttrue/UniGLTF@1d41ff0