CultureInfo support

[stevehansen]

Should we go for explicit InvariantCulture, use the CurrentCulture (this is what we have now), or somehow pass/configure the CultureInfo to use?

https://github.com/stevehansen/RecordCommander/blob/80252da8cc181ac9f22d1166846032c3b13495a6/RecordCommander/RecordCommandRegistry.cs#L345