The version 1.63 satisfies our requirements for MSRV and provides
significant benefits so this commit bumps it. This commit also starts
using weak dependencies.
Add `githooks` directory and:
- Copy the default pre-commit hook into new githooks directory
- Add a call to clippy to the pre-commit hook
- Add a section to the README instructing devs how to use the new
githooks
Jose Storopoli
Martin Habovstiak
Tobin C. Harding