Upgrade dependencies and move away from unmaintained crates (#20)

* updated deps

* upgrade to 2021 Edition

* migrate outdated and unmantained dependencies such as clap, and the unmaintained memmap to memmap2

* updated deps

* upgrade to 2021 Edition

* solved merge issue and rebase branch

* fixed mistakes introduced while rebasing

* fix windows build

* code formatting fixes

* reorder command line args in alphabetical order