Add conditional spawning component (#1069)

* Add conditional spawning component

* Remove null checks

* Remove leftover return

* Properly spawn items when game rule gets added

* Fix duplicate uids in saltern

* GameRules returns IEnumerable using yield.

Resources/Textures/Objects/markers.rsi/meta.json

@@ -1 +1 @@
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+{"version": 1, "size": {"x": 32, "y": 32}, "license": "CC-BY-SA-3.0", "copyright": "Taken from https://github.com/vgstation-coders/vgstation13/blob/e71d6c4fba5a51f99b81c295dcaec4fc2f58fb19/icons/mob/screen1.dmi", "states": [{"name": "cross_blue", "directions": 1, "delays": [[1.0]]}, {"name": "cross_green", "directions": 1, "delays": [[1.0]]}, {"name": "cross_red", "directions": 1, "delays": [[1.0]]}, {"name": "AI", "directions": 1, "delays": [[1.0]]}, {"name": "Assistant", "directions": 1, "delays": [[1.0]]}, {"name": "Atmospheric Technician", "directions": 1, "delays": [[1.0]]}, {"name": "Bartender", "directions": 1, "delays": [[1.0]]}, {"name": "Botanist", "directions": 1, "delays": [[1.0]]}, {"name": "Captain", "directions": 1, "delays": [[1.0]]}, {"name": "Cargo Technician", "directions": 1, "delays": [[1.0]]}, {"name": "Chaplain", "directions": 1, "delays": [[1.0]]}, {"name": "Chemist", "directions": 1, "delays": [[1.0]]}, {"name": "Chief Engineer", "directions": 1, "delays": [[1.0]]}, {"name": "Chief Medical Officer", "directions": 1, "delays": [[1.0]]}, {"name": "Clown", "directions": 1, "delays": [[1.0]]}, {"name": "Cook", "directions": 1, "delays": [[1.0]]}, {"name": "Curator", "directions": 1, "delays": [[1.0]]}, {"name": "Cyborg", "directions": 1, "delays": [[1.0]]}, {"name": "Detective", "directions": 1, "delays": [[1.0]]}, {"name": "Geneticist", "directions": 1, "delays": [[1.0]]}, {"name": "Head of Personnel", "directions": 1, "delays": [[1.0]]}, {"name": "Head of Security", "directions": 1, "delays": [[1.0]]}, {"name": "Janitor", "directions": 1, "delays": [[1.0]]}, {"name": "Lawyer", "directions": 1, "delays": [[1.0]]}, {"name": "Medical Doctor", "directions": 1, "delays": [[1.0]]}, {"name": "Mime", "directions": 1, "delays": [[1.0]]}, {"name": "Paramedic", "directions": 1, "delays": [[1.0]]}, {"name": "Prisoner", "directions": 1, "delays": [[1.0]]}, {"name": "Psychologist", "directions": 1, "delays": [[1.0]]}, {"name": "Quartermaster", "directions": 1, "delays": [[1.0]]}, {"name": "Research Director", "directions": 1, "delays": [[1.0]]}, {"name": "Roboticist", "directions": 1, "delays": [[1.0]]}, {"name": "Scientist", "directions": 1, "delays": [[1.0]]}, {"name": "Security Officer", "directions": 1, "delays": [[1.0]]}, {"name": "Shaft Miner", "directions": 1, "delays": [[1.0]]}, {"name": "Station Engineer", "directions": 1, "delays": [[1.0]]}, {"name": "Virologist", "directions": 1, "delays": [[1.0]]}, {"name": "Warden", "directions": 1, "delays": [[1.0]]}, {"name": "cross_pink", "directions": 1, "delays": [[1.0]]}, {"name": "observer_start", "directions": 1, "delays": [[1.0]]}, {"name": "spawner_melee", "directions": 1, "delays": [[1.0]]}, {"name": "spawner_rifle", "directions": 1, "delays": [[1.0]]}, {"name": "spawner_pistol", "directions": 1, "delays": [[1.0]]}]}