Extract `SortOrder.Mixed` and `SortOrder.FilesFirst` as separate (additive) options

[LastExceed]

There is no need for these 2 options to be mutually exclusive with any of the others, nor each other. Allowing combinations with these would enable more granular user configuration, without the need to implement any new comparisons for the sorting algorithm, nor sacrificing any possible configuration that is currently available.

Proposed design

Add 2 new checkboxes:

• separate folders from files (Default: Enabled)
• place files before folders (Default: Disabled)

Example & Motivation

(For context, in Rust projects all¹ directories under /src are accompanied by a file with the same name) Notice how far apart the food.rs file and food directory are in the left example, despite sematically being the same thing. This is quite inconvenient

Considerations

• Migrate existing user configurations
  • mixed will become SortOrder.Default + disable separate folders from files
  • filesFirst becomes SortOrder.Default + enable files before folders
• Rename FoldersNestsFiles to something like NestsFirst (since folder placement would now be configured separately)
• (Related but not required) Find a way to emphasize the fact that all options fall back to lexicographic ordering in case of ambiguity, illuminating the fact that default is nothing but that in the process

Implementation

I'd like to implement this myself, but I need feedback on the proposed design, and guidance on how to perform the required migrations

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¹pre-1.30 projects use a bunch of mod.rs files instead, but that's beside the point

[vs-code-engineering[bot]]

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Happy Coding!