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get UV on curve by arclen in VEX

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I think using primuvconvert() now that it has been fixed in 16.5.323 you can go one better in that primarclen() only worked on nurbs and bezier curves.

Using primuvconvert() you can get an arclength from u for all curve types including polygonal curves AND you can use it to go in the other direction i.e. get a U value for a given arclength:

//get arclength from u
f@lenC = primuvconvert(@OpInput1, 1, 0, 8)[0];

//get U on curve using arclength
f@u = primuvconvert(@OpInput1, @lenC, 0, 10)[0];


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