Refactored the model.py module

[kmadisa]

Refactored the two huge methods setup_sim_quantities and add_actions, respectively. This is to make it easier to read, debug, and also maintain.

Signed-off-by: Katleho Madisa katleho.madisa47@gmail.com

Screenshots or code snippets (if appropriate):
N/A

Definition of Done Checklist

• Code meets our python style guidelines?
• Unit tested (coded, passed, included)?
• Requested at least 2 reviewers?
• Commented code, particularly in hard-to-understand areas?
• Made corresponding changes to the documentation (e.g. Python documentation, System Engineering Documentation, version description updates, README file, etc)?

JIRA: N/A