* Add a derive procmacro to implement the Builder Lite pattern for a struct
* Add `#[non_exhaustive]` and derive `BuilderLite` where necessary in I2C module
* Add `#[non_exhaustive]` and derive `BuilderLite` where necessary in UART module
* Add `#[non_exhaustive]` and derive `BuilderLite` where necessary in SPI module
* Update `CHANGELOG.md`
* Fix build errors in HIL tests
* Fix generated doc comments
* Return a `ParseError` rather than panicking
* Add a method to set the value to `None` for `Option` types
* Teach `xtask` about the `qa-test` package
* Create the `qa-test` package and move some examples to it
* Check `qa-test` package in CI
* Add `README.md`
