setLocalState sets local user state for logging purposes
 
   Allows users to add local state variables to a log file.
   This is used to store additional user data that gets time
   synchronized with logged feedback. The state does not
   get sent to any device and has no other purpose.
 
   Example
     trialNumber = 27;
     localState = LocalStateStruct();
     localState.state1 = trialNumber;
     group.setLocalState(localState);