Converts reagents to use typepaths instead of IDs.
Centralises reagent spawning in a lot of places to use reagents_to_add instead of a variety of custom methods or initialise overrides.
rscadd: "Adds the ability to remove appendix and other organs in character setup."
rscadd: "Adds two kidneys! Splits the work up between the two organs."
Also adds the ability for a mechanical liver and kidneys,appendix
