Appease linter

[malleoz]

These changes meet the requirements for the default linter settings for Ruff. This includes line length limits (88 chars); checking for unused imports, variables, etc.

This PR also includes the following changes:

• Add @staticmethod decorators when applicable
  • https://github.com/TASLabz/mkw-scripts/issues/15
• reduce pointer chain re-use by defining class instance pointers
  • This will be further reviewed to condense further, as some classes are subclasses of others
• slight legibility improvement via RKGTuple
• slight readability improvement via divmod when encoding RKG header data

[malleoz]

There were a few functions in which I accidentally left out the return keyword.