Code linting changes, additional comments, and a variable rename

[michelcrypt4d4mus]

Just a series of small changes I made while reading the code base that should have zero functional impact.

1. Add a lot of semicolons
2. Add some comments about what i understand the code to be doing
3. Rename featureScorer variable to featureScorers because it's an array
4. Alphabetize some imports and insert some whitespace
5. Cleanup multiline code that calculates mean and currentMean for readability

There are 4 tests that fail when I run npm run test but those tests are also failing on the main branch so I don't think I broke anything.