mmd vmd格式解析

https://blog.goo.ne.jp/torisu_tetosuki/e/bc9f1c4d597341b394bd02b64597499d

The issue links to an external Japanese blog post about MMD VMD format parsing. Start by reading the linked post to understand the VMD format specification. Then examine the project's codebase for existing file parsing modules to see where VMD support might be added. Determine what 'done' looks like by checking if there are tests for other format parsers or if there's a clear API for adding new formats.

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