Suggestion: Add refactoring for Hashtable

[VahidN]

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Suppose we have an old code like this (belongs to .NET 1x):

namespace SimpleParser
{
    public class IanaEncodings
    {
        private static readonly Hashtable _map = new Hashtable();

        static IanaEncodings()
        {
            _map["CP037"] = 37;
            _map["CSIBM037"] = 37;
        }
    }
}

It would be really useful to have a refactoring for converting the Hashtable to a Dictionary to avoid the future boxings. The structure of this Dictionary should be detected from the usage of the _map here: Dictionary<string, int>