[heycam/webidl] feat: Rename numeric types to match Rust/WASM (#856)

Since there was support for <https://github.com/heycam/webidl/issues/843>, I decided to go ahead with opening a PR for this.

I decided to go with `i*` for signed integers because it’s what browser engines and the **Rust** programming language use and due to **ECMAScript** providing implicit support for 32‑bit signed integers using the binary **OR** operator, but none for unsigned integers:

```js
let numI32 = (num | 0); // Converts `num` to a 32-bit signed integer
```

**ECMAScript** `Array`s also restrict the length to a positive 32‑bit signed integer.

---

Resolves #843


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### :boom: Error: 400 Bad Request :boom: ###

[PR Preview](https://github.com/tobie/pr-preview#pr-preview) failed to build. _(Last tried on Mar 17, 2020, 3:05 PM UTC)_.

<details>
<summary>More</summary>


PR Preview relies on a number of web services to run. There seems to be an issue with the following one:

:rotating_light: [CSS Spec Preprocessor](https://api.csswg.org/bikeshed/) - CSS Spec Preprocessor is the web service used to build Bikeshed specs.

:link: [Related URL](https://api.csswg.org/bikeshed/?url=https%3A%2F%2Fraw.githubusercontent.com%2FEB-Forks%2Fwebidl%2Fde28afc8b9a1904d17c8a880c55274fada961f7f%2Findex.bs&md-warning=not%20ready)

```
Error running preprocessor, returned code: 1.
FATAL ERROR: IDL SYNTAX ERROR LINE: 1 - skipped: "typedef (i8) byte"
 ✘  Did not generate, due to fatal errors
```

_If you don't have enough information above to solve the error by yourself (or to understand to which web service the error is related to, if any), please [file an issue](https://github.com/tobie/pr-preview/issues/new?title=Error%20not%20surfaced%20properly&body=See%20heycam/webidl%23856.)._
</details>

You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/856


-- Commit Summary --

  * feat: Rename numeric types to match Rust/WASM

-- File Changes --

    M index.bs (838)

-- Patch Links --

https://github.com/heycam/webidl/pull/856.patch

https://github.com/heycam/webidl/pull/856.diff


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