[Refactor] [Boring] Cleanup for clarity

[Dabir]

Mostly focused on item.dm but involves a hell of a lot of other files. Lots of proc renaming to make what they do clearer, rearranged the procs in item.dm to be in a relatively logical order, first procs inherited from parents, then its own procs, both sorted alphabetically except that New() is at the start and there's a couple of groups of related procs at the ends of the sections.

E: I fucked it