[2.0.72] ItemPrototype:additional_fuel_categories

[thesixthroc]

This API would mirror RecipePrototype:additional_categories (or more realistically the replacement for this API in 2.1).

The heating entity in the Cerys mod consumes only solid fuel. For this to work, solid fuel is changed to a new fuel_category "chemical-or-radiative", and that FuelCategoryID is then added to the fuel_categories of many different BurnerEnergySource.

If another mod similarly wants to give special behavior to solid fuel, the only way to implement is to use more cascadings `-or-`, e.g. `chemical-or-radiative-or-solid`, causing awkward code in mods as with recipe categories in 2.0.