Add fault handling code mostly used to detect when the serial port disappears while a GVRET style device is connected. Beginnings of code to add a reconnect button.

connections/connectionwindow.h

@@ -52,6 +52,7 @@ private slots:
     void handleRemoveConn();
     void handleEnableAll();
     void handleDisableAll();
+    void handleReconnect();
     void handleRevert();
     void handleNewConn();
     void handleClearDebugText();