Add separate Iron Coast mission, weapon and enemy mods with SD HD artwork and audio

examples/mods/iron_coast_turret/mod.toml

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+id = "iron_coast_turret"
+name = "Iron Coast Turret"
+version = "1.0.0"
+api_version = 1
+description = "Armored ground defense with aimed heavy shells. Includes SD and HD artwork, deterministic Rhai AI and generated sound effects."
+content = "content.json"
+scripts = ["scripts/ai.rhai"]