Racial traits that affect research costs

**What do you want to see?**
Racial traits that affect the research costs of certain techs, such as physics. They would also affect the cost of techs that branch off of those techs, e.g. sensors.

**How would it help players?**
Allow for more diversity in empire research. If a tech you like is too expensive, make it cheaper by picking a racial trait!

**Alternatives**
N/A

**Screenshots and mockups**
N/A

**Things to consider**
N/A