more logic cleanup:
more logic cleanup:

- m_occludedLastFrame was necessary for _onlyTransitions pass which
  did not keep the m_occluded state of the previous frame
  (fixed with labels.cpp:83)

quitejonny/tangram-es,cleeus/tangram-es,tangrams/tangram-es,tangrams/tangram-es,cleeus/tangram-es,cleeus/tangram-es,quitejonny/tangram-es,quitejonny/tangram-es,tangrams/tangram-es,quitejonny/tangram-es,tangrams/tangram-es,cleeus/tangram-es,cleeus/tangram-es,quitejonny/tangram-es,cleeus/tangram-es,quitejonny/tangram-es,tangrams/tangram-es,tangrams/tangram-es,tangrams/tangram-es