[Segually]

Summary

Adds CreatureManager, which lets mods register custom creatures that behave like built-in ones.

Creatures are registered from embedded resources: a .txt file holds the creature's data lines and an optional matching .png provides its sprite.

CreatureManager.Instance.RegisterFromEmbeddedResources(Assembly.GetExecutingAssembly(), "MyMod.Creatures.");

Harmony patches make registered creatures show up where the game expects them:

• ResourceControl.GetTextFileLines: serves the creature's data lines instead of reading from disk
• ResourceControl.AssignCreatureSprite: serves the registered sprite
• CreatureMorpher.GenerateCreatureLists / LoadPlainCreatureFromDisk and BreedControl.LoadEverythingFromDisk: ensure the names are in the creature lists
• BreedControl.SetUpBreeder: adds buttons for the custom creatures, and recomputes the game's max_buttons_y scroll limit afterwards (the game derives it from the vanilla button count, so without this the added rows can't be scrolled to)
• CreatureMorpher.GetRandomCreature: occasionally picks a custom creature (hardcoded 15% chance, not currently configurable)

Changes

• New Creatures/Creatures.Systems.cs (Creature, CreatureManager, patches), plus empty Creatures.Events.cs / Creatures.Interfaces.cs stubs following the layout of the other modules.
• Base.GamePlugin.cs: initialize CreatureManager.

Notes

• Split out of a larger set of changes; the other PRs (assets, interactables, .gitignore) are independent of this one. The only overlap is a small init registration in Base.GamePlugin.cs, which may need a trivial conflict resolution depending on merge order.
• Builds cleanly on its own against current main.

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