Added drop announcement for dragon platelegs, skirt and black mask (10)

Server/data/configs/item_configs.json

@@ -37135,6 +37135,7 @@
     "ge_buy_limit": "10",
     "examine": "Looks pretty heavy.",
     "durability": null,
+    "rare_item": "true",
     "weight": "9",
     "absorb": "3,0,6",
     "equipment_slot": "7",
@@ -42028,6 +42029,7 @@
     "ge_buy_limit": "10",
     "examine": "This looks pretty heavy.",
     "durability": null,
+    "rare_item": "true",
     "weight": "9",
     "absorb": "3,0,6",
     "equipment_slot": "7",
@@ -76427,6 +76429,7 @@
     "examine": "A magic cave horror mask.",
     "grand_exchange_price": "989400",
     "durability": null,
+    "rare_item": "true",
     "name": "Black mask (10)",
     "tradeable": "true",
     "weight": "10",