Update to winit 0.30

[emilk]

Also needed:

• Update accesskit_winit #4219

[mwcampbell]

The accesskit_winit update for winit 0.30 is released now.

[lylythechosenone]

Updating to wgpu 0.20.0 should be an important goal here as well. Not sure if that should be a separate issue.

[torokati44]

That's already done: #4433

[AndriBaal]

I updated winit to 0.30.0 and was able to successfully run the hello-world example successfully with wgpu.

Here is a summary of the changes I made:

• Bump accesskit to version 0.14.0
• Bump winit to 0.30.0
• Partially done the glow integration
• Roughly implemented accesskit
• Implemented winit / wgpu

Here is a summary of things that need to be done:

• Integration with glow. We have to wait until glutin-winit updates to winit 0.30.0
• Not all accesskit_winit::Event are being processed, temporarily I have marked them with todo! (found in winit_integration.rs)
• Move from deprecated winit::EventLoop::run_on_demand to new Application trait
• Documentation and testing
• Code review

I have madew a pull request with my changes here: #4466

[mwcampbell]

You can see how to properly handle all the accesskit_winit events in this branch that I never got around to completing and submitting as a PR because, at the time, updating accesskit_winit led to cargo deny problems in CI. That problem is solved now, so feel free to take code from my branch, including my changes to the egui crate.