Revert recent file system changes (#11370)

* Revert "FS: use std::filesystem::u8path"

This reverts commit cd016be86e.

* Revert "VFS: fix missing path deliminators"

This reverts commit 84753db574.

* Revert "Bugfix of Emulator::Load disc path searching"

This reverts commit b9179de288.

* Revert "fs: Reimplement path resolving using std::filesystem::weakly_canonical"

This reverts commit 0c4b2ff06b.

Utilities/File.h

@@ -645,9 +645,6 @@ namespace fs
 		std::string m_dest{}; // Destination file path
 	};
 
-	// Get real path for comparisons
-	std::string resolve_path(std::string_view path);
-
 	// Delete directory and all its contents recursively
 	bool remove_all(const std::string& path, bool remove_root = true);