Retune Iron Coast waves, enemy attacks and weapon presentation

mods/iron_coast_boss_5/content.json

@@ -35,12 +35,12 @@
     {
       "id": "iron_coast_boss_5:unit",
       "name": "Cinder Hammer",
-      "health": 160,
+      "health": 400,
       "speed": 0,
       "reward": 1800,
       "ground": false,
       "boss": true,
-      "cooldown": 54,
+      "cooldown": 96,
       "art": {
         "png": "art/unit-sd.png",
         "hd_png": "art/unit-hd.png",