gbx: 1st part of GSMS (Gbox Short Message Service) implementation into oscam

For more details see: http://www.streamboard.tv/wbb2/thread.php?&threadid=40522&page=2

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@9664 4b0bc96b-bc66-0410-9d44-ebda105a78c1