exit gracefully and call destructor of the current active example

fflush after printf
implemented stepForward and Shutdown for the SharedMemory client/server

examples/SharedMemory/SharedMemoryInterface.h

@@ -18,6 +18,7 @@ enum SharedMemoryClientCommand{
     CMD_LOAD_URDF,
     CMD_STATE_UPDATED,
     CMD_STEP_FORWARD_SIMULATION, //includes CMD_REQUEST_STATE
+    CMD_SHUTDOWN,
     CMD_MAX_CLIENT_COMMANDS
 };