v3.0.0 checklist

[zoton2]

This update is being built upon some work I already did for NodeCG v2 usage but never merged into main. I will be targeting NodeCG v2.3.x which properly supports Node.js v22 (LTS) which means I can properly move to using "ES Modules" (ECMAScript) as the output on the extension builds.

• Overhaul the tsconfig.json files and how they work.
• Convert extension code to properly build.
• Convert browser based code to properly build.
• Remove module-alias/custom paths.
• Add shared file for replicants in browser context.
• Migrate to ESLint v9 and flat configs.
• Add .vscode files.
  • extensions.json
    • Any other recommended extensions to add?
  • settings.json
    • Tweak file nesting patterns for ESLint v9.
• Remove env.d.ts?
• Remove nodecg-cli, don't install nodecg and suggest users install it globally (or add it as an optional dependency?)
• Add/switch to Sass or SCSS.
• Improve type file setup overall.
  • This includes ESLint related things.
  • Do we need a specific tsconfig.json setup?
• Update README.md file.
  • Note why we use draft-07 JSON schema spec (VSCode).
  • Note (with a link) about additional Quasar configuration.
• Any additional file comments that may be useful for future reference/other users.

[zoton2]

Things that I've changed but made a note of to verify I don't have issues with them in real world use-cases:

• dashboard template having font-size: unset !important (which removes Quasar's 14px font-size setting, and seems to make it 16px); does this have any side effects with Quasar elements?
• I have tweaked the Quasar primary colour to match that of the NodeCG primary colour, but need to test the rest of the colours.