* Refactor window creation and size handling
* Require pixel aspect ratio to be > 0
* Fix screen scaling when window is resized
- Ensure the screen retains its correct pixel aspect ratio
- Updated public API on `RenderPass` ... this will continue to be unstable until the initial release
- Add build instructions for the internal shaders
* Enable clippy in CI
- Removed beta and nightly channels to prevent build breakage
- Fixed some lints noted by `pedantic` and `nursery` level (but not denying these levels by default)
- Accepts a closure (factory function) which itself accepts references to the `wgpu` instances needed for rendering
- This solves a need for creating `RenderPass` objects with a lot of `Option` types and trying to update them dynamically after the fact
- In other words, this is an RAII implementation
- `RenderPass` objects are created during the `PixelsBuilder` build stage
- It should prevent patterns where half-created `RenderPass` objects are necessary
- The example app generates a scaled version of pixel Ferris as a test.
- TODO:
- Pixel aspect ratio is still unsupported
- The `RenderPass` trait is incomplete
