Adds a procedural gorgon creature class, acting as an alternative to night trolls.
This has a lot of complicated code to allow for a lot of variants, so I'll do a quick run through.

There are six gorgon tweak archetypes: centaurine, armed serpent, inorganic, scaly, winged, and basic.
Centaurine and armed serpent use a custom tweak to change the body plan - this logic is complicated enough to be its own file (tweak_centaur). I've also used btc1_tweaks to allow other random creatures to be eligible for these tweaks if they qualify.
Basic doesn't prevent tweaks, but in practice that just gets taken up by being twisted into humanoid form.

They pick a random snake RCP to use in their description, and if that snake is poisonous, they can bite with venom. They also choose one primary attack spell (blinding or paralysis). They have a prepare interaction, where they let out a low hiss and have a 1/2 chance to get a petrification attack that turns the victim into their statue type.

The statue caste is comprised of a random inorganic, using the material they're made of if possible. They're pretty much just the Instantly-evaporating creature from the wiki.

There's also a more minor tweak included, which allows random creatures to have a humanoid face. This is mainly to make the centaur effect less prevalent.

Example creature description:
Jade Gorgon // Lavender Jade Statue
A large humanoid comprised of lavender jade. It has three long, curly tails and its head is a thick mass of writhing pythons. All that gaze upon it shall become as stiff as stone.

To spawn in the arena:
Set the debug_level > 0 to generate one gorgon of each archetype. If > 0.5, then they will be given debug names.