clean out unneeded unity .meta files

Scripts/Data/Chart.meta

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Scripts/Data/Chart/Chart.cs.meta

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Scripts/Data/Chart/Difficulty.cs.meta

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Scripts/Data/Chart/MeasureBeat.cs.meta

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Scripts/Data/Chart/Note.cs.meta

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Scripts/Data/Chart/NoteEvent.cs.meta

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Scripts/Data/Chart/NoteHold.cs.meta

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Scripts/Data/Chart/NotePlay.cs.meta

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Scripts/Data/Mer.meta

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Scripts/Data/Mer/Mer.cs.meta

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Scripts/Data/Mer/MerNote.cs.meta

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