Fixes and enhancements.

- Added ability to change inner border width of console window.
- Fixed a nasty bug that prevented key press handling.
- Reset now clears the accumulator and index registers.

src/main/java/com/loomcom/symon/Preferences.java

@@ -8,11 +8,15 @@ public interface Preferences {
 
     public static final int DEFAULT_ACIA_ADDRESS = 0xc000;
 
+    public static final int DEFAULT_BORDER_WIDTH = 10;
+
     public JDialog getDialog();
 
     public int getProgramStartAddress();
 
     public int getAciaAddress();
 
+    public int getBorderWidth();
+
     public void updateUi();
 }