Remove authors fields from Cargo.tomls

[lunacookies]

The authors field has been effectively soft-deprecated, as it is no longer required, shown on crates.io or docs.rs, and crates created with cargo new no longer automatically create the authors field. Keeping or removing the field is of course a matter of taste, but I thought that, since it doesn’t have any effect anymore, it might be easier to just remove it instead of updating it over time as contributors come and go.

[hawkw]

In the case of the console CLI app, the authors field will auto-populate the help text generated by clap, which might be worth keeping, especially in the case that the CLI is ever packaged by distros. But, we can add authors to the help text using an attribute, as well, so it's not critical that we keep it in the cargo metadata.

This is fine with me!