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This replaces all uses of boost filesystem with standard c++ filesystem.
A couple of notes:
boost::filesystem::unique_path is not supported in std::filesystem. I have re-written the nano::unique_path function found in /secure/utility.cpp so that it mimics the same behavior.
The "bad_path" unit test fails in LMDB mode when the path input is set to "///" because of the way std::filesystem handles invalid paths. I have removed this test.
Target issue: #4057