Inifix

- ENH: expose name column length parameter to users in inifix-format
[PR 73](https://github.com/neutrinoceros/inifix/pull/73)
- BUG: fix formatter behaviour
[PR 83](https://github.com/neutrinoceros/inifix/pull/83)

BUG: fix a bug in str casting
[PR 80](https://github.com/neutrinoceros/inifix/pull/80)

ENH: improve schema validation and add a file validation pre-commit hook
[PR 74](https://github.com/neutrinoceros/inifix/pull/74)

This version is identical to 0.7.0 except that `FutureWarning`s are now raised for
api calls using future positional-only arguments using the keyword syntax.

This version is identical to 0.6.0 except that it's compatibly for Python 3.6 to
3.10. Positional-only arguments are not specified any more because their are not
available for Python versions earlier than 3.8 Warnings may be added in a
following version to discourage usage of keyword syntax for these arguments.