Added the SLUGS icon and asigned it to the Menu entry related to the SLUGS view

mavground.qrc

@@ -82,6 +82,7 @@
         <file>images/mapproviders/openstreetmap.png</file>
         <file>images/mapproviders/google.png</file>
         <file>images/mapproviders/yahoo.png</file>
+        <file>images/contrib/slugs.png</file>
     </qresource>
     <qresource prefix="/general">
         <file alias="vera.ttf">images/Vera.ttf</file>

src/ui/MainWindow.ui

@@ -322,7 +322,7 @@
   <action name="actionShow_Slugs_View">
    <property name="icon">
     <iconset resource="../../mavground.qrc">
-     <normaloff>:/images/categories/applications-internet.svg</normaloff>:/images/categories/applications-internet.svg</iconset>
+     <normaloff>:/images/contrib/slugs.png</normaloff>:/images/contrib/slugs.png</iconset>
    </property>
    <property name="text">
     <string>Show Slugs View</string>