rename BLANK to EMPY, enhances separator render, fixes menu selection

plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/EmptyWaveform.java

@@ -18,6 +18,15 @@ import java.util.List;
 public class EmptyWaveform implements IWaveform {
 
 	private String label = "";
+
+	
+	public EmptyWaveform() {
+	}
+
+	public EmptyWaveform(String label) {
+		this.label = label;
+	}
+
 	@Override
 	public void addPropertyChangeListener(PropertyChangeListener l) {
 	}
@@ -96,12 +105,12 @@ public class EmptyWaveform implements IWaveform {
 
 	@Override
 	public WaveformType getType() {
-		return WaveformType.BLANK;
+		return WaveformType.EMPTY;
 	}
 
 	@Override
 	public String getKind() {
-		return "BLANK";
+		return "separator";
 	}
 
 	@Override

plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/WaveformType.java

@@ -22,5 +22,5 @@ public enum WaveformType {
 	/** The filter. */
 	FILTER,
 	/** The blank line. */
-	BLANK
+	EMPTY
 }