Fix: Discord compat fixes from upstream BetterDiscord 1.12.5

- Import the updated webpackmodules.js from upstream BetterDiscord
  to prevent BdBrowser from causing an empty white page.
- Removed canBootstrapNewUpdater.

Fix: BetterDiscord 1.12.0 compat fixes

- Workaround: `fetch` in the Service Worker does not fill the
  statusText property, which causes BetterDiscord to report an error.
- Added the missing new function to bdpreload.

Fix: Discord re-rolling Webpack modules yet again

- Access to the StorageModule is no longer possible, so the `preload`
  now saves an instance of localStorage for static use in the LocalStorage
  class of BdBrowser.

Fix: Discord re-rolling Webpack modules

- Fixes the definition of the StorageModule in Discord's webpack.
  Otherwise the VFS would be stuck during initialization due to an
  exception, thus preventing the loading of BetterDiscord.

Fix: Null openItem, use bd-open-path instead

- Fixes an issue that occured starting with BetterDiscord 1.10.0 resulting
  in an inability to "open" theme or plugin directories to upload new files.
  (Reported by @Spectre-856)
- Added a simple preselection logic for the filetype to the file chooser.
- Adjusted eslint checks for declarations in case statements.

Bugfix: BetterDiscord gets initialized outside the indended web client

- BdBrowser's check for `getCurrentUser` is not sufficient to determine
  whether a user really is in the web client, as the UserStore module also
  gets loaded on the OAuth authorization prompt. This causes BD to
  initialize on unintended parts of Discord's website.
  To combat this, the presence of the GuildStore will also be checked now.
  (Reported by @Serega007RU)

Fix: Preload Patcher

- Replaced the preload patcher with an updated
  upstream version from BetterDiscord.

Bugfix: Web requests broken after 58b9cf

- Due to slight variations in the export of functions, nativeFetch and https
  shims failed to convert the Uint8Array body content to a Buffer because of
  calls to an invalid reference. The function is now being correctly
  exported in the polyfill to prevent further regressions of this kind.

Fix: Buffer module was removed in client application

- Integrated an alternate Buffer module implementation to
  counter the removal of the Buffer module in the webpack.
- Removed the now-defunct Buffer reference from discordmodules.js.
- Added copies of the licenses to the `dist` folder that were
  missing after the new dist structure.
- Removed unnecessary events from ipcrenderer.js.
- Added bd-get-accent-color IPC response.

Refactoring: Project Structure & Tooling

- Switched from npm to pnpm.
- Modularized the build for each component.
- Improved the bundling, all required artifacts for the extension are
  now being collected in the `dist` directory after `build-prod`.
- Fanned out the modules in `frontend` to make it easier to identify
  what is a Node shim, an Electron shim etc. This is still ongoing.
- Applied the BetterDiscord ESLint rules to BdBrowser and fixed most
  of the issues ESLint reported.
- Added GitHub Actions workflow to automatically generate build artifacts.
- Removed the `dist` folder from the repository, please download a release
  from the GitHub releases page instead or build BdBrowser yourself.
- Added `dist` directory to .gitignore to reinforce the previous point.
- Changed the location of local BetterDiscord renderer overrides.
  Instead of putting the betterdiscord.asar or renderer.js into the `dist`
  directory, please put them into `dist/bd/` instead.
  Note: BD's renderer.js is now expected as `renderer.js` instead of
  the previous name `betterdiscord.js`.
- Corrected some minor spelling errors.
- Early shim for BetterDiscord's upcoming nativeFetch.