switch theme inheritance from uni-parental (??) to multi-lineal, niche inheritance (??)

basically, just use the correct biology / ethnology terms to indicate that we're not breeding themes / theme components from parents/grandparents etc, we're composing them which afaict, is more familiar to mycologists than breeder / mate-selection dynamics

possibly related:
[Niche Inheritance: A Possible Basis for Classifying Multiple Inheritance Systems in Evolution](https://link.springer.com/article/10.1162/biot.2007.2.3.276)
[Niche inheritance: a cooperative pathway to enhance cancer cell fitness through ecosystem engineering.](https://www.ncbi.nlm.nih.gov/pubmed/24700698)