Code Health Work

[Rover656]

Description

Just an absolute wall of code health changes. Setting up checkstyle to try and keep stuff consistent and setting up a github action that will comment recommendations on PRs.

Todo

• Work this out later :)

Checklist:

• My code follows the style guidelines of this project (.editorconfig, most IDEs will use this for you).
• I have performed a self-review of my own code.
• I have commented my code in areas it may be challenging to understand.
• I have made corresponding changes to the documentation.
• My changes are ready for review from a contributor.

[Rover656]

Going to merge this - it doesn't change code other than fixing violated rules. Rules can be softened or hardened at a later date, and the automatic PR reviewer is functional.