Import CEV-Eris maintenance doors (#982)

Resources/Textures/Buildings/Doors/airlock_maint_cargo.rsi/meta.json

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+{"version": 1, "size": {"x": 32, "y": 32}, "license": "CC-BY-SA-3.0", "copyright": "Taken from https://github.com/discordia-space/CEV-Eris/blob/d86e175508b8553ca8396f39f2af7ecec4595375/icons/obj/doors/Doormaint_cargo.dmi", "states": [{"name": "closed", "directions": 1, "delays": [[1.0]]}, {"name": "closed_unlit", "directions": 1, "delays": [[1]]}, {"name": "closing", "directions": 1, "delays": [[0.2, 0.1, 0.1, 0.1, 0.1, 0.6]]}, {"name": "closing_unlit", "directions": 1, "delays": [[0.2, 0.1, 0.1, 0.1, 0.1, 0.6]]}, {"name": "deny", "directions": 1, "delays": [[0.1, 0.1, 0.1]]}, {"name": "locked", "directions": 1, "delays": [[1.0]]}, {"name": "open", "directions": 1, "delays": [[1.0]]}, {"name": "opening", "directions": 1, "delays": [[0.2, 0.1, 0.1, 0.1, 0.1, 0.6]]}, {"name": "opening_unlit", "directions": 1, "delays": [[0.2, 0.1, 0.1, 0.1, 0.1, 0.6]]}, {"name": "panel_closing", "directions": 1, "delays": [[0.2, 0.1, 0.1, 0.1, 0.1, 0.6]]}, {"name": "panel_open", "directions": 1, "delays": [[1.0]]}, {"name": "panel_opening", "directions": 1, "delays": [[0.2, 0.1, 0.1, 0.1, 0.1, 0.6]]}, {"name": "spark", "directions": 1, "delays": [[0.1, 0.1, 0.1, 0.1, 0.1, 0.1]]}, {"name": "sparks_broken", "directions": 1, "delays": [[0.1, 0.1, 0.1, 0.1, 0.1, 0.1]]}, {"name": "sparks_damaged", "directions": 1, "delays": [[0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 1.7]]}, {"name": "sparks_open", "directions": 1, "delays": [[0.1, 0.1, 0.1, 0.1, 0.1, 0.1]]}, {"name": "welded", "directions": 1, "delays": [[1.0]]}]}