Not doing for ages, don't any reason to keep the stubbed stuff around.

Not pinning dev dependencies. It's not a big deal, and we're not in prod.

Top-level await yaaaay

"class-methods-use-this" is just annoying, not much benefit to static methods in JS,
and doesn't work well with our PanelHandler system

Idk, eslint updated and their config changed. Fun!

This causing people headaches, and not super beneficial.

Kiiiiind of works with debugger! And assume we'll want this once SCell's
thing is in.

There absolutely no code changes here, just moves, to keep files linked in Git and so review is easier.

Don't like having a dedicated script for something simple as this, better in <script> tag.

I know this feels a bit framework-y but with modules it's really needed,
otherwise exposing stuff to XML takes a lot of boilerplate.

Generators waow!!

Chungus commit but not that much to break up. Tried to not refactor too
much but I tweaked some things as I went. Couple of general comments:
- Suffixing every class with "Handler" is very verbose but omitting it
  will be a namespace collision for JS-defined panels like
  LevelIndicator, so figured I'd keep consistent and suffix everything.
- static is no longer required everywhere because of @PanelHandler
  instantiating classes it's applied to. Maybe a bit too magical, but I
  like not having static on absolutely everything.
- We should avoid .bind(this) with event handlers, it's easy to
  introduce type errors when using it, since it provides no type-safety
  between the event handler function signature and the function it's
  applied to. Arrow functions do the same thing, and make the arguments
  explicit.

This stuff is all interconnected so figured I'd split them out from main ts port commit
Refactored a bit of gamemode handling logic as well, needed a C++ fix to get config
loading working with new modes, that's in review on red.

Show/HideContentPanel weren't doing anything. ReloadBackground is ambigious. Guhh!!!

Not doing much styling in this PR, just couldn't resist improving these slightly.

This thing just confuses people, had multiple people ask why it doesn't work.
Doesn't look very good in its current state, may as well just hide for now.

Toop was having issues with default line endings in vscode, this should
set right defaults