This is the 1.0 tracking issue not tracking the first 1.0-alpha release, that is done on #4204

TODO

• Close all issues labelled with 1.0 and C-units

https://github.com/rust-bitcoin/rust-bitcoin/issues?q=is%3Aopen+is%3Aissue+label%3A1.0+label%3AC-units

• Consider all serde issues

https://github.com/rust-bitcoin/rust-bitcoin/issues?q=is%3Aissue%20state%3Aopen%20serde%20