* bumped version and 'about' dialog

* cleaned up HDCD decoding code
* added processPriorityIdle option to settings dialog

AudioCodecsDotNet/AudioCodecsDotNet.cs

@@ -25,6 +25,7 @@ namespace AudioCodecsDotNet
 		void Write(int[,] buff, uint sampleCount);
 		bool SetTags(NameValueCollection tags);
 		void Close();
+		void Delete();
 		long FinalSampleCount { set; }
 		string Path { get; }
 	}
@@ -141,6 +142,10 @@ namespace AudioCodecsDotNet
 		{
 		}
 
+		public void Delete()
+		{
+		}
+
 		public long FinalSampleCount
 		{
 			set
@@ -575,6 +580,14 @@ namespace AudioCodecsDotNet
 			_IO = null;
 		}
 
+		public void Delete()
+		{
+			_bw.Close();
+			_bw = null;
+			_IO = null;
+			File.Delete(_path);
+		}
+
 		public long Position
 		{
 			get