Add proper temperatures for WC and WN stars

[GurrenLagannTSS]

Partially implements and closes #901.
Also added temperatures for WNh stars as a workaround, avaiable when using luminosity classes II, I-a, I-b, and I-a0 for WN-class stars.

[375gnu]

1. All commits should be squashed into a single one
2. Reference to the sources should be left in comments so we can validate temperatures and so on

[Trolligi112477-ww]

Sources: https://arxiv.org/pdf/1904.04687.pdf
https://arxiv.org/pdf/1807.04293.pdf
Wikipedia
Logic

oh wait... maybe the WN5-WN6 temps should be lowered

[AstroChara]

Hang on, what's the current issue with this thing?