Merging SlugHelper and SlugHelperForNonAsciiLanguages into a single class with a SupportNonAsciiLanguages property in SlugHelperConfiguration class

[cemilf]

It seems that it is possible to use single class to support Non Ascii Languages without a separate class.

We can add a boolean property to SlugHelperConfiguration to support NonAsciiLanguages. Than a simple if statement will be enough to call UnicodeDecoder.UniDecode(inputString) method.

if (config.SupportNonAsciiLanguages){    
    inputString = UnicodeDecoder.UniDecode(inputString);
}

var normalizedInput = inputString.Normalize(NormalizationForm.FormD);

What do you think?

[ctolkien]

This would be fine, but also a breaking change, so would need to go out in a V6. I'd probably suggest we could add this in a v5.2, and obsolete the old way, to give people a heads up to move to the newer way.

[cemilf]

Yes exactly. Adding obsolete would do the trick.

[ctolkien]

Tracked now in #157