work

important news:
- much better (almost complete) subframe-accurate particle support (trail scatter, timeblend qL, )
- various bug fixes to important nodes (timeblend, attr visualize, etc.)
- Waypoint now refreshes itself when it's finished writing (this bug basically defeated any interdependent waypoints rendered using ROP networks)
- new: Curve Extend qL SOP (nothing fancy but much better than the plain nothing we had before)