Camps can handle crafting liquid

[RenechCDDA]

Summary

Features "Liquids crafted at camps will try to be placed inside zoned terrain/furniture that can hold them(LIQUIDCONT)"

Purpose of change

Crafting liquids at camps dumped them on the ground (lol)

• Closes Faction camp liquid recipe results should be stored in containers #50627

Describe the solution

During the camp's zone initialization it registers a vector of absolute tripoints where it can place liquids (furniture or terrain with the LIQUIDCONT flag). These are saved much like the existing dumping_spot.

When placing crafting results, it checks if the result is liquid and if so, tries to find an entry in the vector where there are no items already existing (most of the time liquids can't mix). Basically, "find an empty barrel and dump it in there".

If it doesn't find one, fine - it just reverts to putting the liquids where everything else goes. It also gives the player a popup explaining why it's dumping their precious crafting results on the ground.

Describe alternatives you've considered

Some sort of selectable menu like with personal crafting where you could select a valid container/(terrain/furniture?) to hold your new liquids

Testing

3x3 empty storage zone full of bathtubs, places new solid items at the center point (get_dumping_spot always uses the center of the zone), but places liquid items at the first evaluated point that can hold them (top-left):
https://github.com/CleverRaven/Cataclysm-DDA/assets/84619419/8f6280cf-ea9c-45ed-aa39-5cdb0856e824

3x3 storage zone with SOME possible containers, some items already in the area, and not all tiles covered in possible containers! Places new solid items at the center point, but places liquid items at the first evaluated point that can hold them (bottom-right, last spot to be evaluated):
https://github.com/CleverRaven/Cataclysm-DDA/assets/84619419/84e68b03-9ea9-4e9c-85f0-a50fbe59182b

Warning popup if resulting items would be placed on the ground (placement will still happen, but it lets the player know why):

It successfully handles batch results, placing them all together at once.

Additional context

Known deficiencies:

-Although furniture can be a LIQUIDCONT I don't think zones are reinitialized unless the player modifies them in some way, so you could go push a toilet into your storage, initialize them, push the toilet out, and the game will happily dump crafted liquids onto the empty tile where it thinks a toilet is. Re-checking the zones is a bit more than I want to bite off here. Haha, they're reset right before the crafting results get placed! Perfect, nothing to worry about here.

-I have not touched the save game functions as of this writing so it probably doesn't persist after a save and load cycle.
They're reset before placement so I actually don't know why this would need to be serialized to the save except for legacy. This has no legacy equivalent, so it shouldn't matter.

-It cannot handle container items. Only furniture and terrain with LIQUIDCONT. This was intentional to KISS.

[PatrikLundell]

It would definitely be useful to have a new zone type for crafted liquid contents and have the zone being capable of specifying what liquid it takes (so the clean water goes into water tanks, milk goes into (refrigerated) milk tanks, etc.) so you wouldn't have to search your various targets to see where things ended up this time. Default would be no modifier, so any storage would do.

[GuardianDll]

Not for this PR, but for a future development: new zone "containers for liquids", and NPC by default use containers from this zone for craft?

[RenechCDDA]

I can make no promises for future zones with dynamic data-driven interactions, the implementation here turned out to be extraordinarily simple.

[RenechCDDA]

OK I still don't know what the save functions are necessary for this, but clang thinks they are, so they have been implemented. I checked the save manually just to make sure I wasn't going to nuke it, too. Just saves the tripoints as a list. Whoopie.