gbx: Add GSMS OSD Feature
     Add for WebIf last GSMS MSG to reader Structure 
     Details see http://www.streamboard.tv/wbb2/thread.php?postid=508452#post508452

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@9669 4b0bc96b-bc66-0410-9d44-ebda105a78c1