Design an optimal power inductor for a given inductance value, core shape and
current. The function will determine the optimal number of turns, air gap, and
litz wire to minimize the combined core loss and proximity loss in the inductor.
inputs:
L - [H] inductance.
core_index - defines the core shape
[t, ily] - typical current
il_peak - [A] peak current

outputs:
Ploss_total - [W]. total inductor loss