refs #716, UI component for simulator message (what messages to relay to simulator)

* component itself
* integrate in tab panel
* minor UI adjustmenets

src/blackgui/components/settingsnetworkserverscomponent.ui

@@ -143,22 +143,6 @@
      </layout>
     </widget>
    </item>
-   <item>
-    <spacer name="vs_Buttons">
-     <property name="orientation">
-      <enum>Qt::Vertical</enum>
-     </property>
-     <property name="sizeType">
-      <enum>QSizePolicy::Fixed</enum>
-     </property>
-     <property name="sizeHint" stdset="0">
-      <size>
-       <width>20</width>
-       <height>20</height>
-      </size>
-     </property>
-    </spacer>
-   </item>
   </layout>
  </widget>
  <customwidgets>