Support for sockets and files

[DemiMarie]

Many applications need to be able to perform asynchronous network and file I/O from the main thread, with notification via a callback.

[maroider]

Can you elaborate on what exactly it is you want from winit in this regard? It's a bit hard to tell from such a brief issue text, and my best guess would be some sort of "async/await" integration for the event loop closure.

[DemiMarie]

Pretty much. I want to be able to use asynchronous network and file I/O libraries in the same thread as GUI operations. Electron integrates the Node.js event loop (libuv) with the Chromium event loop, so it is possible.

[maroider]

I believe this has already been discussed in #1199.