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Detect and remove unused functions #3

@Anton-Latukha

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@Anton-Latukha

Would be great if flatten could track what functions are really used. And then if possible, - variables.
Maybe it is done already in the flatten, I not looked at this time.
If flattened scripts deliberately have some sort of additional info for shellfire development after, flatten can have a option --strip

Like start from:
core_init_main "$@" and recursively check what functions use what functions.
And; as script has the only one entry point, root node - core_init_main - that means all functions not connected with core_init_main can be cleaned-out.

Basic overdrive example parses example right after flatten. So I see it probably works well without unconnected functions.

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