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

examples/mods/iron_coast_turret/scripts/ai.rhai

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+// Ground emplacements inherit deterministic terrain scrolling (one pixel/tick).
+fn on_spawn(event, state, random) {
+    #{ commands: [], state: state }
+}
+
+fn on_tick(event, state, random) {
+    #{ commands: [], state: state }
+}
+
+fn on_fire(event, state, random) {
+    state.shots = if state.contains("shots") { state.shots + 1 } else { 1 };
+    #{ commands: [#{ op: "play_sound", sound: "iron_coast_turret:shot" }], state: state }
+}
+
+fn on_hit(event, state, random) {
+    state.hits = if state.contains("hits") { state.hits + 1 } else { 1 };
+    #{ commands: [], state: state }
+}
+
+fn on_death(event, state, random) {
+    state.destroyed = if state.contains("destroyed") { state.destroyed + 1 } else { 1 };
+    let defeated = if event.objectives.contains("iron_coast_turret:defeated") { event.objectives["iron_coast_turret:defeated"] + 1 } else { 1 };
+    #{ commands: [
+        #{ op: "objective", key: "iron_coast_turret:defeated", value: defeated },
+        #{ op: "play_sound", sound: "iron_coast_turret:death" }
+    ], state: state }
+}