Reagent/solution changes

[ElectroJr]

#19323 changes how solutions/reagents work, with the goal of allowing reagents to carry additional data (e.g., dna for blood). The main change is that reagents are now uniquely identified by a ReagentId struct instead of the prototype ID string. Datafields that used to specify reagent prototype IDs should generally be replaced with this struct.

This PR also makes various changes to solutions & SolutionContainerSystem methods. Note that it is likely that the new reagent data functionality will change in the near future to address any issues that come up while blood/dna data actually gets implemented.