feat(port): allow vertical movement for avatar in water

[Vollch]

Purpose of change

Now you can actually swim out of freshwater research station through underwater hatch.

Describe the solution

Ported CleverRaven/Cataclysm-DDA#65174.

Describe alternatives you've considered

None.

Testing

Swim around. Diving test is also passing.

Additional context

Checklist

[Vollch]

The Autofix app has automatically formatted this Pull Request.
...

Do we really need all that spam in comments..?
I'm pretty sure this comment won't go away even after squashing, and big PRs can easily end with dozen of such messages.

[scarf005]

Do we really need all that spam in comments..?

it was supposed to be a friendly help message for first time contributors, because there has been much pain around formatting. haven't seen multiple comments from bots, however. have there been one?

[Vollch]

Well, those comments wasn't here long enough to give it a chance to start spamming. But i don't see why it wouldn't, in PRs formatted multiple times. Like here: #3691, #3716
(I also had PRs with few auto-formats, but they all squashed by now)

[scarf005]

if the comments get too spammy then i'll disable it.

[scarf005]

2023-11-27_13-42-28.mp4

it's not possible to go down from 3x3 hole but only go up, but otherwise neat addition.

[Vollch]

it's not possible to go down from 3x3 hole but only go up

Well, yeah. Diving mechanic and freshwater mapgens doesn't perfectly match each others. I'm not decided yet what would be the best way to fix it.
It might be fixed by adding GOES_DOWN flag to pools. Or changing pool's terrain to regular deep water. Or reworking checks in diving code so it'll work for any "water cube up to deep water", "deep water down to water cube", "water cube up\down to water cube" shifts, without looking at GOES_* flags at all.
Or maybe it's worth to port this thing from DDA, which along the way introduces another diving related flag: CleverRaven/Cataclysm-DDA#68340
I'm leaning toward last option, for better portability, but not really sure that problem it fixes is exists in BN. I need to test it first, i suppose.