Output: interpolated strings & culture

[ig-sinicyn]

There're places in the codebase that fails to pass the host culture into formatted strings,
as example:

            builder.AppendLine($"Skewness = {s.Skewness}, Kurtosis = {s.Kurtosis}");

the output is

ConfidenceInterval = [45.8375 us; 45.8375 us] (CI 95%)
Skewness = не число, Kurtosis = не число

hotfix: just add .ToStr()

Sadly, there's no good solution for it. You can wrap all interpolated strings into

using static System.FormattableString;
...
            builder.AppendLine(Invariant($"Skewness = {s.Skewness}, Kurtosis = {s.Kurtosis}"));

but it'll result in additional FormattableString instantiation per call, not to mention issue with targeting to 4.5.
Long story short, string interpolation does not play well with logging : (

[AndreyAkinshin]

It seems that we should just use the .ToStr() hotfix, I don't know a good solution for this problem.