Feature: Add support for non-circular center-posts. #20
Description
Is your feature request related to a problem? Please describe.
Many planar magnetic cores do not have circular center posts. They can be in the shape of a rectangle or a "stadium", which allows for larger post areas while keeping a low core profile as well as low effective core thicknesses to avoid ferrite dimensional issues at high frequencies. We should add support for these shapes.
Describe the solution you'd like
The solution should off some flexibility on winding starting and ending position. Both need to be specified now rather than simply the number of turns as non-circular cores loose axial symmetry.