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

examples/mods/ion_lance/mod.toml

@@ -0,0 +1,7 @@
+id = "ion_lance"
+name = "Ion Lance"
+version = "1.0.0"
+api_version = 1
+description = "Naval science-fiction ion lance: independent weapon, equipment, SD/HD artwork and local firing/impact audio."
+content = "content.json"
+scripts = ["scripts/weapon.rhai", "scripts/equipment.rhai"]