[Media] `no_std` for Wgpu & Winit

In between PRs for IO in core and alloc, I've been working on no_std support for Wgpu and Winit. Specifically to solve this issue opened by Dinnerbone around getting wasm32v1-none (a no_std alternative to wasm32-unknown-unknown) working. To demonstrate the viability of the effort, I've published a port of the Wgpu examples working on wasm32v1-none using my PRs as patches.

Feel free to have a look at the code, but what I think is notable is how completely benign it is; these are 99% the original examples, with most of the changes being using Winit 0.31 instead of 0.30.

I and many others have been toiling away at this problem for a while now, and it's great to finally see some light at the end of the tunnel!