Adds custom artifact creation. Adds the dead harvest artifact effect

Created by: Skullyton

Re-approaches #10742 by making it an artifact effect, rather than a snowflaked object.

The dead harvest effect checks for dead mobs in its vicinity, should it find any, it will gib them and add points to its internal reservoir. Should it reach enough points, it will spawn a mob from an internal mob list (4 different variations of list as of right now. Regular necromancy mobs, infection-based zombies, necromorphs, and a randomly generated list).

The different effect triggers do different things. Should it be touch based, any mob living or dead will be harvested that touch it, unless they are the controller (First person to touch it, assuming it can be controlled)

Should it be pulse based, the artifact will revive mobs that are in its spawn list in the vicinity of the object.

Should it be aural based, it's much more random to whether it will harvest and/or spawn a mob.

Because I got tired of having to spawn a shit ton of artifacts to try and test this, I added in custom artifact creation to the admins secret tab. It's not overly robust, but it's better than nothing.

🆑

• rscadd: Adds the dead harvest artifact effect