Update to winit 0.30

[stefnotch]

Winit recently released a new version, where they overhauled the preferred way of doing the event loop. Would it be possible to get an updated version of this lovely library?

I also took a look at how much effort this would be:

• The examples will need to be updated
• The current update API will no longer work nicely, so it needs to be replaced
• Drawing in about_to_wait seems to be discouraged now https://docs.rs/winit/latest/winit/application/trait.ApplicationHandler.html#method.about_to_wait

[rukai]

Thanks for the investigation!
I won't be able to do it myself any time soon but I might be able to review PRs.