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Currently the codebase does not specify an edition, which results in a warning and cargo uses the 2015 edition. This PR takes the codebase to the 2021 edition in steps. The first commit specifies the current 2015 edition. The second commit specifies the 2018 edition, and updates the codebase to use the 2018 path conventions described at https://doc.rust-lang.org/edition-guide/rust-2018/module-system/path-clarity.html. The third commit bumps to the 2021 edition. No code changes were required to support the 2021 edition.