Add filtering operations

src/main/java/presenters/NavPresenter.java

@@ -44,6 +44,10 @@ public class NavPresenter {
         navigator.showFourier();
     }
 
+    public void goToFiltering(){
+        navigator.showFiltering();
+    }
+
     public GrayScaleMatrix getImageGrayMatrix() {
         //return ((CImageNG)appState.getImage()).getMatrice();
         return imageService.getImage().toGrayScale();