Trail Scatter qL SOP overhaul

[johnnyquest]

::2.0

• especially replacing Scatter SOP with the new one
• num points should be divided by dop step size
• add a Num Points Scale Multiplier!

[johnnyquest]

• velocity jitter should be also "forwards/backwards-aware"
• velocity jitter might need to be scaled by substeps?

[johnnyquest]

seeds should totally be floating-point (for subframes)

[johnnyquest]

working on it...