Add help and standardised argument parsing to all scripts

[dhruvkb]

Currently the scripts are all over the place, and have no standard implementation for parsing arguments, proving auto-completion functionality, and providing help and man pages. This needs to be solved by using appropriate packages and possibly even rewriting the scripts in a more developer-friendly language like Python (using argparse).

The mission is to standardise all scripts, add helpful instructions, combine with #11 to make arguments an alternative to runtime input and also consider providing auto-completion and man pages.