Refactoring mesa-examples

[adamamer20]

• [ ] Bank reserves

• [ ] Boid flockers

• [X] Boltzmann wealth model

• [ ] Boltzmann wealth model network

• [ ] Caching and replay

• [ ] Charts

• [ ] Color patches

• [ ] Conway's Game of Life

• [ ] El Farol

• [ ] Epstein civil violence

• [ ] Forest fire

• [ ] Hex snowflake

• [ ] Hotelling law

• [ ] PD grid

• [ ] Schelling

• [ ] Shape example

• [ ] Sugarscape CG

• [ ] Sugarscape G1MT

• [ ] Virus on network

• [ ] Wolf-sheep