* Use `std::matches!`
- Remove crates.io `matches` in favor of the `std` version
- Fix Clippy warning by changing a `match ... { ... }` to
`matches!(...)`
* Satisfy `blocks_in_if_conditions`
* Add proc_macro2 and quote dependencies
* Completly switch over to proc_macro2 where possible
* Remove unessesary ::from casts
* Remove pendantic cast that i missed
* Make Builder::push_tokens accept TokenStream
* Remove stray commented out code
* Reword unclear comment on `Span` to a todo item
* Move comment closer to its intended line
* Use into instead of explicit conversion
