Retune Iron Coast waves, enemy attacks and weapon presentation

mods/iron_coast_boss_6/content.json

@@ -20,17 +20,17 @@
     {
       "id": "iron_coast_boss_6:unit",
       "name": "Iron Crown Command Dreadnought",
-      "health": 160,
+      "health": 420,
       "speed": 0,
       "reward": 1800,
       "ground": false,
       "boss": true,
-      "cooldown": 54,
+      "cooldown": 90,
       "art": {
         "png": "art/unit-sd.png",
         "hd_png": "art/unit-hd.png",
-        "logical_width": 96,
-        "logical_height": 64
+        "logical_width": 108,
+        "logical_height": 72
       },
       "script": "scripts/ai.rhai"
     }