Support for breakpoints

- Adds a new window that allows adding and deleting breakpoints.
  Will halt the simulator when a breakpoint is reached.

src/main/java/com/loomcom/symon/ui/MemoryWindow.java

@@ -26,6 +26,8 @@ package com.loomcom.symon.ui;
 import com.loomcom.symon.Bus;
 import com.loomcom.symon.exceptions.MemoryAccessException;
 import com.loomcom.symon.util.HexUtil;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import javax.swing.*;
 import javax.swing.border.EmptyBorder;
@@ -37,8 +39,7 @@ import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.util.EventObject;
-import java.util.logging.Level;
-import java.util.logging.Logger;
+
 
 /**
  * This Frame displays the contents of a page of memory. The page number to be displayed
@@ -46,6 +47,8 @@ import java.util.logging.Logger;
  */
 public class MemoryWindow extends JFrame implements ActionListener {
 
+    private static final Logger logger = LoggerFactory.getLogger(MemoryWindow.class);
+
     private MemoryTableModel memoryTableModel;
     private JTable memoryTable;
     private JTextField pageNumberTextField;
@@ -209,9 +212,9 @@ public class MemoryWindow extends JFrame implements ActionListener {
             } catch (NumberFormatException ex) {
                 // An invalid number was entered. Log the error, but otherwise
                 // take no action.
-                Logger.getLogger(this.getClass().getName()).log(Level.WARNING, "Can't parse page number " +
-                        pageNumberInput);
+                logger.warn("Can't parse page number {}", pageNumberInput);
             }
+
             updateControls();
         }
     }