ash v0.38 support

[attackgoat]

There are lots of small changes required to support the latest version of ash, and this also requires updating winit to v0.30. The windowing changes require the EventLoop code to be completely re-evaluated for usefulness: I want something easy to use in the general case but able to be extended for custom uses also.

TODO:

• [x] New examples/app.rs to demonstrate winit v0.30 patterns
• [x] Make sure gpu-allocator is updated for ash
• [ ] Make sure vk-sync-rs is updated for ash
• [x] Re-work EventLoop and all examples as needed
• [x] Wait for updates to egui and imgui or move the examples out of the main crate

[attackgoat]

https://github.com/rukai/winit_input_helper/pull/61 https://github.com/expenses/vk-sync-rs/pull/2 https://github.com/Traverse-Research/gpu-allocator/pull/218

[attackgoat]

https://github.com/emilk/egui/pull/4466 https://github.com/imgui-rs/imgui-rs/issues/781

[attackgoat]

vk-sync-rs has not been updated yet, so the crate cannot be published in this state, but these changes will allow the other open issues to bugfix against an up-to-date ash version which includes many other fixes.