Base: WebSocket Polyfill

[cookiengineer]

Currently, the Browser's Client API requires a global WebSocket API available, which is only the case for the WebView/headles platform as of now.

In order to make the Browser available on the node.js side, the POLYFILLS.mjs should also include a WebSocket polyfill that implements the client-side WS13 protocol.

• Backport the crux.socket.WS implementation from lycheejs.
• Backport the WebSocket() API usage to have a 1:1 replacement.
• Implement a review for the base.mjs file.

[cookiengineer]

In order to have a WebSocket polyfill, the /base/source/node/WebSocket.mjs file has to be implemented.

Additionally, the following reviews have to be implemented:

• base/review/Buffer.mjs
  - [ ] base/review/browser/WebSocket.mjs
  - [ ] base/review/node/Buffer.mjs
  - [ ] base/review/node/WebSocket.mjs

Afterwards, the base/review/index.mjs needs to be patched to contain above new polyfills.

[cookiengineer]

As of fe0e1e3 this is not necessary anymore.

Stealth is now so modular that both the Browser and Tab interface are compatible with the browser Project and also can run in the node.js context.

Therefore the browser, as of now, only consists of Browser.mjs and ENVIRONMENT.mjs that both have DOM and Web API dependencies. Everything else is completely isomorphic, so that Stealth can run as a headless Browser now, too.