based on time change. would be nice if dep graph could handle this. - made dep check if modifiers need update on time change - fix render crash (access null) - added new Build Effect modifier type. compared to old one works as a full member of modifier system, means can apply subsurf, etc on it, reorder, what have you. and it is all nice and self contained. - removed old Build effect, old files convert to new style on load - couldn't help myself, added a randomize feature to build effect - removed Python BuildEffect support