added plotter interface description

data/ArmarXGui/VariantInfo-ArmarXGui.xml

 <?xml version="1.0" encoding="utf-8"?>
 <VariantInfo>
 	<!-- ArmarXGui has no Variants :/ -->
+    <!-- But ArmarXGui has other stuff :-D -->
+    <Lib name="ArmarXGuiInterfaces">
+        <Topic include="ArmarXGui/interface/StaticPlotterInterface.h"
+            humanName="Static Plotter Topic"
+            typeName="StaticPlotterInterfacePrx"
+            memberName="staticPlotter"
+            getterName="getStaticPlotterTopic"
+            propertyName="StaticPlotterName"
+            propertyIsOptional="true"
+            propertyDefaultValue="StaticPlotter" />
+    </Lib>
 </VariantInfo>