396: Remote buffer destruction r=kvark a=kvark



Co-authored-by: Dzmitry Malyshau <kvarkus@gmail.com>

396: Update wgpu without peek-poke r=cwfitzgerald a=kvark

Depends on gfx-rs#739
Everything works, however I think it's worth changing the render pass color/depth/stencil descriptors to be more rusty, e.g.
```rust
struct ColorAttachmentDescriptor {
  attachment: &'a TextureView,
  resolve_target: Option<&'a TextureView>,
  clear_color: Option<Color>,
  store_result: bool,
}

enum DepthStencilChannel<T> {
  ReadOnly,
  Mutable { clear_value: Option<T>, store_result: bool },
}
struct DepthStencilAttachmentDescriptor {
}
```
This would also involve wgpu-type/wgpu-core changes, but can be done as a follow-up (don't want to block on them).

There is a value in doing it in this PR, so that end users don't get multiple disruptions, but we need to find a proper shape first.

Co-authored-by: Dzmitry Malyshau <kvarkus@gmail.com>