Move util functions out of cgaz.js

[PeenScreeker]

This pull request moves math functions out of the cgaz.js file to separate util files math.js and colors.js. The intent is to move these out for:

• reducing mental load reading cgaz.js
• prep to make cgaz modular components (like all other hud tools)
• potential reuse by other contributors (color functions, and mapping angles to the screen)

Upon merging this PR, cgaz.js should be broken up into separate tools. It seemed appropriate to break this into two separate pull requests to keep the refactor organized.

Checks

• I have thoroughly tested all of the code I have modified/added/removed to ensure something else did not break
• I have followed semantic commit messages e.g. feat: Add foo, chore: Update bar, etc...
• My branch has a clear history of changes that can be easy to follow when being reviewed commit-by-commit
• My branch is functionally complete; the only changes to be done will be those potentially requested in code review
• All changes requested in review have been fixuped into my original commits.
• Fully tokenized all my strings (no hardcoded English strings!!) and supplied bulk JSON strings below

[tsa96]

Since these are global utilities now, we should absolutely get them over to TypeScript. I've done colors.ts for you, math.ts should be very easy.

[tsa96]

Sorry didn't realise I hadn't resolved everything