Sort entries with natural sorting

[lucaseras]

Does #306. Some screenshots of Oil after this change:

With default sorting

Before, the file 15 would come before 9. Likewise, v114.lua would come before v24.lua

With descending name

Happy to make this an optional feature!

[stevearc]

Thanks for the PR! I pulled this locally to profile it and kick the tires. There was a bug in the implementation: if you sort by other columns (e.g. size) the values can be numbers. I moved the natural ordering into the definition of the name column, and then also put it behind a config option because I profiled it as being about an order of magnitude slower. For most situations this is probably fine, but if you work with large directories it could cause pauses, so I want to make sure there's a way to disable it.

LMK if this approach works for you

[lucaseras]

Sweet, looks good! Appreciate the help 🙏🏻