Add Spline Mask

Please add a spline node which will sever any splines based on a mask.

Currently, using an object mask with an interlink node will break the interlink node's ability to cross into other chunks. A node which takes the interlink node output and then cuts all splines if the next node of the spline is in a masked area (so a road doesnt travel all the way to a sea edge, optionally) Would be very useful.