Move AUR helper functionality to common-script

[nnyyxxxx]

Type of Change

• [x] New feature
• [x] Refactoring

Description

Moves all of the AUR Helper functionality into the common-script

Testing

Works perfectly

Additional Information

Might want to look into #215 and see what conflicts might arise between these two PRs

Checklist

• [x] My code adheres to the coding and style guidelines of the project.
• [x] I have performed a self-review of my own code.
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] My changes generate no errors/warnings/merge conflicts.