Decentralize small_animal and fish factions

[Karol1223]

Summary

None

Purpose of change

As I outlined in #75829 I wanted to decentralize small_animal to allow for better hunting simulation of small animals. This aims to achieve that.

Describe the solution

Factions done:

• Mammals
• Birds + Bat
• Reptiles
• Frogs
• Fish

Other changes:

• Removed vermin faction as it served only as a base for the rat faction and gave me complications in the animal_tiny implementation
• Removed molerat faction as it was an unused remnant of the mutant molerats I removed ages ago
• Halved the snake abstract's aggression since it turned out not to need it, and this way worm snakes won't anger the safemode popups
• Gave the snapping turtle aggro_character: false so it doesn't chase the player unless it is approached, only then it's provoked to attack
• Changed the monster the cormorant copied from to be in line with the other water birds
• Moved the feaver to herbivore, to match other beavers
• Moved the dachshund to dog_small, as it is too small to zombify so it shouldn't be interesting to zombies

Describe alternatives you've considered

Testing

Additional context

Currently a lot of this granularity goes unused. We have very few predators who differentiate between flightless/flying birds for example. This is okay because factions don't cause much if any overhang, but it allows us to possibly better simulate predator factions in the future.

The big issue is most predators we have are really not specialized at all. A raccoon or a fox isn't gonna care whether it's looking at a lizard or a bird chick. The granularity mainly comes in handy with semiaquatic predators like otters or snapping turtles, to make sure they don't go onto land too much.