[Suggestion] Curve the npeghole primitives

[Max Murtazin]

As there is no prim substitution doen on the level of lo res prims, then we do not need a tang, imho.

PS: the end-condlines of 8/3-8cylo are wrong

Edit: Attached the sample

So, I have updated all of the primitives using this one

Unfortunately, both LDFind and LDStructure refuse to work on my PC so I can't check if it works properly on all parts.

Help with getting list of the parts featuring npeghole primitives will be much appreciated