Draft: Withdrawn: Pollinators

This is probalby obsolete! I strongly prefer !6 (merged), which is also more elaborate in terms of prosaic text.

@reichold @nolzen Another trial...

Shows some cool dynamics, but already has 800 lines of Yarner sources, compared to 500 for the predation model (without predation).

@nolzen You can find the executable in the build artifacts.