Use argparse for argument parsing

[Timmmm]

This is more maintainable and scalable and gives better errors and a nice --help message. The interface is compatible with the previous version.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.01%. Comparing base (383cbca) to head (7ce8046).
Report is 6 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (383cbca) and HEAD (7ce8046). Click for more details.

HEAD has 5 uploads less than BASE

Flag	BASE (383cbca)	HEAD (7ce8046)
	10	5

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #314       +/-   ##
===========================================
- Coverage   96.53%   74.01%   -22.52%     
===========================================
  Files          10        3        -7     
  Lines         750      408      -342     
===========================================
- Hits          724      302      -422     
- Misses         26      106       +80     

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[Timmmm]

@aswaterman @IIITM-Jay please could I get a review of this?

[aswaterman]

Manually merged via #331

[Timmmm]

Thanks!

[aswaterman]

You're welcome!