Faction camp and mission companion issues and improvements

Problem

The faction camp and companion mission code has a host of issues. I'm opening this issue as a tracker.

Mission descriptions should move to JSON
Danger/random encounter descriptions should move to JSON
The Tacoma Commune east field farming missions aren't companion missions and should move into dialogue. They can be entirely implemented in dialogue now.
~~faction camps shouldn't have a parallel set of crafting recipes. Select crafting recipes should be marked as craftable in faction camps.~~ Fixed in #30508

There needs to be one calculation of a companion or threat's offense and defense values.
Hunting, patrolling, raiding, and escorting caravans all need to use the same code to resolve off-screen combat.
Foraging, patrolling, and raiding all need to use the same code to get results for faction camps and companion missions.
~~faction camp crafting needs to use the same batch calculation time as the rest of CDDA~~ Fixed in #30508
~~upgrade/crafting times are calculated by hand, and will get out of sync with CDDA as CDDA recipes change.~~ Fixed in #31209 for non-primitive basecamps.

~~A lot of the code is very oddly coded or outside standard-ish CDDA idiom.~~ Pretty much fixed.

Faction camp upgrade status is tracked by changing overmap tile ids. This is bad and needs to get changed fixed but these bugs remain: since it means the vehicles can't be on a camp tile when the camp gets upgraded, and that players can deconstruct buildings to get the resources to upgrade and have the buildings be replaced. Fixed by #29523
~~Faction camps should store all their status in the existing base_camp structure.~~ Fixed
ter_set/furn_set should register the creation/destruction of terrain and furniture with the local faction camp, and then the faction camp should check what actual resources are available to determine what upgrades/crafting options are available.
~~The camp manager NPC is redundant, and should be replaced by dialogue options to tell people what to do and/or a bulletin board to recover NPC allies.~~ Fixed.

As I think of them.