streamthinca / lloidhandler: detangle trigger class import

- there was a time when streamthinca needed to define a special class to be
  used for triggers to allow the coincidence algorithm to work, and so it
  made sense for the definition to live in streamthinca where the
  requirements were defined.  today no special class is required, the
  underlying trigger class is simply used as-is, but code like lloidhandler
  is still importing the symbol from streamthinca instead of importing it
  themselves directly.  this patch untangles this now gratuituous
  interdependency.