Invariant CLI output

[daveMueller]

closes #1263

[MarcoRossignoli]

Thx I'll take a look asap

[MarcoRossignoli]

@daveMueller some reason to not simply update call sites with val.ToString(CultureInfo.InvariantCulture) and avoid new service?

we can create local helper to reuse private string InvariantFormat(double val) => val.ToString(CultureInfo.InvariantCulture);

Or at least an helper to FormattableString.Invariant(value); or call it directly where needed.

Add new service for it looks to me too much, wdyt?

[daveMueller]

I also thought about this and you convinced me now 😉. It's just a habbit of me to write adapters for things like FormattableString.Invariant(value) to increase testability. But I also had in mind that in this case we don't really benefit much from it.

[MarcoRossignoli]

LGTM