Fixed ctrl sending key events by itself to the emulator. This fixes the ctrl-c issue reported by Michael as well.

src/main/java/jace/core/Keyboard.java

@@ -253,6 +253,10 @@ public class Keyboard implements Reconfigurable {
         }
 
         if (e.isControlDown()) {
+            if (c == 255) {
+                return;
+            }
+            System.out.println("Ctrl: "+(c&0x01f));
             c = (char) (c & 0x01f);
         }