Added ext. keys.

gameplay/src/Keyboard.h

@@ -27,7 +27,7 @@ public:
      * The key (code).
      */
     enum Key
-    {
+    {
         KEY_NONE              = 0,
         KEY_PAUSE             = 0x0013,
         KEY_SCROLL_LOCK       = 0x1014,
@@ -182,7 +182,11 @@ public:
         KEY_LEFT_BRACE        = '{',
         KEY_BAR               = '|',
         KEY_RIGHT_BRACE       = '}',
-        KEY_TILDE             = '~'
+        KEY_TILDE             = '~',
+        KEY_EURO,
+        KEY_POUND,
+        KEY_YEN,
+        KEY_MIDDLE_DOT
     };
 
 private: