Added CachedSound constructor for playing resource wav files

[YJ15]

Added CachedSound constructor for playing resource wav files
I played the wav file of Properties.Resource using the following source code:

public CachedSound(Stream sound) 
{
        using (var audioFileReader = new WaveFileReader(sound))
        {
            WaveFormat = audioFileReader.WaveFormat;
            var sp = audioFileReader.ToSampleProvider();
            var wholeFile = new List<float>((int)(audioFileReader.Length / 4));
            var sourceSamples = (int)(audioFileReader.Length / (audioFileReader.WaveFormat.BitsPerSample / 8));
            var sampleData = new float[sourceSamples];
            int samplesread;
            while ((samplesread = sp.Read(sampleData, 0, sourceSamples)) > 0)
            {
                wholeFile.AddRange(sampleData.Take(samplesread));
            }
            AudioData = wholeFile.ToArray();                
        }
}

[YJ15]

"using System.IO;" Is missing.
I fixed this error.

[sampletext32]

I think it's not good write to a list, it's better to write to a buffer(array) with some offset.

[YJ15]

I think it's not good write to a list, it's better to write to a buffer(array) with some offset.

I create it based on public CachedSound(string audiofilename) in CachedSound.cs.
Since lists are used in the source code, I also used lists.
Why are arrays better than lists?

[jcummings2]

I needed this change as well, so I adapted it for the new layout in pull request #963.