- added modifier_dependsOnTime to check if modifier needs updating

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

source/blender/include/particle_effect.h

@@ -42,8 +42,6 @@ extern void free_effect(Effect *eff);
 extern void free_effects(ListBase *lb);
 extern void copy_effects(ListBase *lbn, ListBase *lb);
 extern void build_particle_system(Object *ob);
-/* used externally */
-void set_buildvars(Object *ob, int *start, int *end);
 
 #endif