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Updating to 0.4 from 0.3

There are a few things that have changed:

1. The use of Instance has been removed. Creating a Surface and requesting an Adapter are done as follows.

let surface = wgpu::Surface::create(window);
let adapter = wgpu::Adapter::request(&wgpu::RequestAdapterOptions {
    ..Default::default()
}).unwrap(); // needs to be unwrapped

2. The request_device method now returns a (Device, Queue) tuple. This means that you can borrow the Queue mutably while using the Device immutably. Because of this change, submitting CommandBuffers to the queue uses the submit method on the Queue directly.

self.queue.submit(&[
    encoder.finish()
]);

3. The create method on Surface takes in any struct that implements the HasRawWindow trait, instead of a RawWindowHandle. This means that the raw-window-handle = "0.3" line in Cargo.toml is no longer needed.

I don't know if this is a change from 0.4, but you use wgpu = "0.4" line in dependencies instead of the [dependencies.wgpu] as wgpu will determine the best back end for you.

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