Cuetools.Converter.exe: support for --decoder-option parameter.

Implemented "Stream" option in BDLPCM Reader to make it possible to select
the right stream in m2ts file.

CUETools.Codecs.WavPack/CUETools.Codecs.WavPack.cpp

@@ -185,6 +185,12 @@ namespace CUETools { namespace Codecs { namespace WavPack {
 			return sampleBuffer->Length;
 		}
 
+                virtual property AudioDecoderSettings^ Settings {
+                    AudioDecoderSettings^ get(void) {
+                        return nullptr;
+                    }
+                }
+
 	private:
 		WavpackContext *_wpc;
 		Int32 _sampleCount, _sampleOffset;