add overloads for selecting <T> by string query

[chillitom]

Add overloads for Process.Extract..() methods to allow choosing generic T by a string key.

Good for when you don't want the query to also be an object of type T.

Simplifies..

var bestMatchName = Process.ExtractOne(name, candidates.Select(pr => pr.Name));

var bestMatch = potentialRacesForTrack.First(pr => pr.Name == bestMatchName.Value);

to

var bestMatch = Process.ExtractOne(name, candidates.Select(pr => pr.Name));