Introduce a mechanism for users to model a disruption in the price of commodities mid-simulation

[dean-krueger]

Hooks should be added for users to manually change the price of a commodity (either by a percent, or to a specific value) at some point in the simulation to represent some outside force affecting the market to represent major disruptions in either supply or demand, or other "unforseen"events which could not otherwise be modeled.

One potential use case is modeling something like the COVID-19 pandemic's effects on prices. Another is a "new technology" which disrupts the market and makes an existing commodity much cheaper.