Change: Optimize csv b3d object parser and object viewer autoreload performance

[adfriz]

• Implement HashSet face lookup in Plugin.Parser.cs
• Add IO caching for File.Exists results during texture loading.
• Optimize NumberFormats.TrimInside to reduce allocations.
• Implement partial reload in ObjectViewer via UnifiedObject caching.
• Add descriptive code comments for better readability.

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[leezer3]

Thanks.

As a small request-
Can you try and preserve the existing comments please.
I've found so many oddities over the years, it's very useful to know exactly why a hack has been added.

Other thoughts-
I'm not sure your FileExistsCache will work too well if a file is deleted or added. It's fine for a single load, but especially now we've got auto-reload kicking in, might want revisiting.

[adfriz]

Thanks.

As a small request- Can you try and preserve the existing comments please. I've found so many oddities over the years, it's very useful to know exactly why a hack has been added.

Other thoughts- I'm not sure your FileExistsCache will work too well if a file is deleted or added. It's fine for a single load, but especially now we've got auto-reload kicking in, might want revisiting.

ok, ill put the comment back.

it works on local builds but your concern is right, ill do more test about it and i think its better to put this PR as a draft.

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