Add lua support for creatures returning from abyss

[rainlizard]

Some people liked my idea of creatures that fall into the abyss being relocated to your portal instead of dying, so here's some lua changes to support that.

• Adds the CreatureFellIntoAbyss lua event.
• Teleporting a falling creature will now prevent its default falling death. Using either lua or a creature spell.
• Adds Creature:remove_from_play(turns) for temporarily placing a creature in limbo. You can use this in any other context (not just for abyss) where you need to take a creature out of play for a while.

function OnGameStart()
    RegisterCreatureFellIntoAbyssEvent(CreatureFellIntoAbyss)
end

function CreatureFellIntoAbyss(event)
    local unit = event.unit
    unit.health = unit.health - 100
    local rooms = GetRoomsOfPlayerAndType(unit.owner, "ENTRANCE")

    if unit.health >= 0 and #rooms > 0 then
        local room = rooms[math.random(#rooms)]
        unit:teleport(room.centerpos, 0)
        unit:remove_from_play(200)
    end
end

In this example I also added 100 falling damage and the creature won't return if it died from the damage taken. But how you use this lua is up to you. Falling can be pretty overpowered:

2026-09-01.15-01-04.mp4