CODEBASE: Recheck all usages of typecasting with JSON.parse

[catloversg]

While we search and fix lint errors, we (kind of) agree that we should not typecast the result of JSON.parse (e.g., JSON.parse(saveString, Reviver) as Something. This PR searches all references of JSON.parse and checks if they are typecasting in a questionable way. My guideline:

• It's fine to typecast to unknown.
• It's fine to typecast after or immediately before the validation code.
• Compromises:
  • If invalid data comes from a third-party tool (RFA client).
  • If proper validation requires an overcomplicated and risky refactor (the god object PlayerObject).

[catloversg]

In the latest commit, I refactored loadStaneksGift. There is a behavior change:

• Old: If saveString is an empty string, we load default data; otherwise, we parse saveString and pretend that everything is okay. If there is an error, the caller (loadGame) will handle it with a try-catch.
• New: Always pass saveString to JSON.parse in a try-catch. Validate the result. If it's invalid, we load default data, then show a dialog.

Rationale:

• BN13 was added in 793d9b3 - v0.54.0 - 26 Sep 2021. saveString can only be invalid (empty string or invalid data) if the save file is older than v0.54.0 or it's a badly edited one.
• Proper validation.
• When the save string is invalid, instead of silently reset data, we show a dialog to warn the player. This is not a problem, unless they try to load an ancient/invalid save file.

From now on, I'll use this code for other "loader" functions if I need to change them (I'm testing another PR that changes loadAllGangs):

let somethingData: unknown;
try {
  somethingData = JSON.parse(saveString, Reviver);
} catch (error) {
  console.error(error);
}
if (!validate(somethingData)) {
  console.error("Invalid somethingData:", saveString);
  somethingData = DefaultData;
  setTimeout(() => {
    dialogBoxCreate("Cannot load data of something. Something is reset.");
  }, 1000);
  return;
}
something = somethingData;

After #1774 is merged, with proper "loader" functions, we can gradually deal with legacy code in loadGame in a safe way.

[d0sboots]

Note to self: Have to test this on the old saves too

[catloversg]

Unrelated question:
We have src\utils\helpers\typeAssertion.ts and src\utils\TypeAssertion.ts. Can I merge them later in another PR (src\utils\helpers\typeAssertion.ts -> src\utils\TypeAssertion.ts)?