add limits to places where offsets to avoid some syntax problems. Rename grooveplayer class to avoid conflict with official libgroove class. Add admin event. Write start of event loop that picks initial song.

src/main.cpp

@@ -17,7 +17,7 @@ int main ( int argc, char** argv )
         server.addEntryPoint(Wt::Application, createApplication);
         if(server.start())
         {
-            GroovePlayer::getInstance();
+            GroovePlayerMgr::getInstance();
             int sig = Wt::WServer::waitForShutdown(argv[0]);
             server.stop();
         }