Refactor various filesystem related operations to use std::filesystem#309

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nightlark wants to merge 8 commits intofelt:mainfrom nightlark:use-std-filesystem

+185-174

Commits on Jan 17, 2025

Use C++17 std::filesystem to create directories and check file stats
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Use std::filesystem to check free disk space available
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Remove platform-specific headers that were previously used to check free disk space
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Use std::filesystem::remove instead of unlink and std::string for file names instead of VLAs
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Replace remaining call to stat with std::filesystem
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Remove sys/stat.h from files that no longer need it
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Fix format specifier warning for diskfree type
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Remove shadow re-declaration of ec variable
nightlark
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