Preparation for NPC jobs - add data to categorize job roles and duties

[ghost]

Summary

SUMMARY: Features "Preparation for NPC jobs - add data to categorize job roles and duties"

Purpose of change

This adds support for NPC job categories and what activities may relate to them.

Describe the solution

Added a bunch of npc_job enums, and associated functions to set/get/clear/get name.
added a map of job_id to std::vector<activity_id> to associate what job categories go with what activities.
The thinking being, an NPC assigned to a camp, and given a job will periodically scan for work to do , based on the activities in that list.

Nothing uses this yet - this is preparation and a conscious realization that I need to break my huge PRs up more into smaller, easier to review sections.

Describe alternatives you've considered

I've copied the structure of NPCATT_*
now this may be what people call "cargo-cult programming"? as NPCATT may be the "wrong" thing to copy, so I'll take guidance on a more logical structure for this sort of thing.

Additional context

N/A