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

examples/mods/ion_lance/scripts/equipment.rhai

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+// Recovery is recorded separately from the weapon firing state.
+fn on_pickup(event, state, random) {
+    let recovered = if state.contains("recovered") { state.recovered % 100000 + 1 } else { 1 };
+    #{ commands: [#{ op: "objective", key: "ion_lance:recovered", value: recovered }],
+       state: #{ recovered: recovered } }
+}

examples/mods/ion_lance/scripts/weapon.rhai

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+// Built-in beam projectiles handle the normal volley and collision rules.
+// Callbacks add deterministic visuals, audio and serializable weapon counters.
+fn on_fire(event, state, random) {
+    let bursts = if state.contains("bursts") { state.bursts % 100000 + 1 } else { 1 };
+    let hits = if state.contains("hits") { state.hits } else { 0 };
+    let commands = [
+        #{ op: "play_sound", sound: "ion_lance:fire" },
+#{ op: "effect", x: event.x, y: event.y - 3 }
+    ];
+    #{ commands: commands, state: #{ bursts: bursts, hits: hits } }
+}
+
+fn on_hit(event, state, random) {
+    let bursts = if state.contains("bursts") { state.bursts } else { 0 };
+    let hits = if state.contains("hits") { state.hits % 100000 + 1 } else { 1 };
+    let commands = [
+        #{ op: "play_sound", sound: "ion_lance:impact" },
+        #{ op: "effect", x: event.x, y: event.y }
+    ];
+    #{ commands: commands, state: #{ bursts: bursts, hits: hits } }
+}