Add convolution and mean filtering

src/main/java/presenters/NavPresenter.java

@@ -47,9 +47,12 @@ public class NavPresenter {
     }
 
     public void goToFiltering() {
-        navigator.showFiltering();
+        navigator.showIdealFiltering();
     }
 
+    public void goToConvolution() {
+        navigator.showConvolutionFiltering();
+    }
 
     public void gotToButterworth() {
         navigator.showButterworth();