Updating CLI argument parser

[aryanjassal]

Description

The CLI argparser was written as something which 'gets the job done'. While this was fine for the project with a strict deadline, I want to improve the code to a sufficiently high level. This is the first step in doing so: updating how the command line interface actually works.

Closes #14

Tasks

This PR has the following actionable items

• Update the structure of the code to build a static command tree
  • Make it trivial to visualise the tree and add new data to it
  • Add utilities to simplify leaf commands and group commands
• Add proper flag support
  • Automatically construct help text with the deepest parsed layer
• Walk the tree to validate the command and arguments
  • Additional flags and arguments should be passed to the handler
• Add flag aliases

[aryanjassal]

It would be cool if I got CI working. Automatically perform linting, building, and invoking help text. I cannot properly test this as I need to write and update the testing library myself, and that is a little lower on the priority list right now.

[aryanjassal]

XOR encryption is a candidate for removal, as AES is much better in every aspect, basically. I will need to check for its uses before going ahead with the removal.

[aryanjassal]

Everything for this PR should be done now. The CLI UX has been completely revamped to aid both developers and users alike. Merging as completed.