Remove menu paths from non-functional commands

Author: ctrueden

src/main/java/net/imagej/ops/commands/convert/ConvertImgPlus.java

@@ -42,7 +42,7 @@
 /**
  * @author Martin Horn (University of Konstanz)
  */
-@Plugin(type = Command.class, menuPath = "Image > Convert")
+@Plugin(type = Command.class)
 public class ConvertImgPlus<I extends RealType<I>, O extends RealType<O>>
 	implements Command
 {

src/main/java/net/imagej/ops/commands/convolve/Convolve.java

@@ -51,7 +51,7 @@
  * 
  * @author Martin Horn (University of Konstanz)
  */
-@Plugin(type = Command.class, menuPath = "Image > Convolve")
+@Plugin(type = Command.class)
 public class Convolve<I extends RealType<I>, K extends RealType<K>, O extends RealType<O>>
 		implements Command {
 

src/main/java/net/imagej/ops/commands/project/ProjectCommand.java

@@ -40,7 +40,7 @@
 import org.scijava.plugin.Parameter;
 import org.scijava.plugin.Plugin;
 
-@Plugin(type = Command.class, menuPath = "Image > Threshold > Project")
+@Plugin(type = Command.class)
 public class ProjectCommand<T extends RealType<T>> implements Command {
 
 	@Parameter(type = ItemIO.BOTH)

src/main/java/net/imagej/ops/commands/threshold/GlobalThresholder.java

@@ -49,7 +49,7 @@
  * 
  * @author Martin Horn (University of Konstanz)
  */
-@Plugin(type = Command.class, menuPath = "Image > Threshold > Apply Threshold")
+@Plugin(type = Command.class)
 public class GlobalThresholder<T extends RealType<T>> extends AbstractOp {
 
     @Parameter