Rename dc class to DropdownButton and add new ExtensionFileFilter and RepaintCallback classes

app/com/efiAnalytics/ui/DropdownButton.java

@@ -14,7 +14,7 @@ import java.util.ArrayList;
 import javax.swing.JMenuItem;
 import javax.swing.JPopupMenu;
 
-public class dc extends cp implements ItemSelectable, ActionListener {
+public class DropdownButton extends cp implements ItemSelectable, ActionListener {
   ArrayList z = new ArrayList();
   
   JPopupMenu A = new JPopupMenu();

app/com/efiAnalytics/ui/RepaintCallback.java

@@ -1,6 +1,6 @@
 package com.efiAnalytics.ui;
 
-public interface dC {
+public interface RepaintCallback {
   void a();
 }