Sets the capacity to the actual number of elements in the List,
if that number is less than a threshold value.
RhinoCommon (in RhinoCommon.dll)
This function differs from the DotNET implementation of List<T>
since that one only trims the excess if the excess exceeds 10% of the list length.
Rhino for MacSupported in: 5.4
Rhino for WindowsSupported in: 6.2