The kind's action-title localization prefix, e.g.
"SOHL.Skill.Action". Each definition's title is <prefix>.<shortcode>.
The setImproveFlag, unsetImproveFlag, toggleImproveFlag, and
improveWithSDR intrinsic action definitions, in that order.
The four improvement-flag / SDR intrinsic action definitions, identical for every improvable item kind apart from their localization keys.
setImproveFlagandunsetImproveFlagare the two halvestoggleImproveFlagis built from: they remain reachable as executors (for scripts and macros that want a known state rather than an inversion) but are hidden from the context menu, which offers the single toggle instead.