Recombination: add Temperature Scaling of SRH Lifetime
This MR adds Shockley-Read-Hall charge carrier lifetime scaling with temperature:
\tau(N, T) = \tau(N) \left( \frac{300 K}{T}\right)^{3/2}
via https://www.sciencedirect.com/science/article/pii/003811019290184E
@kdort would you mind checking the implementation?