Add new Sauna/Avanto Promo with Split Pile (#76)

* Added Sauna/Avanto Promo with Split Pile
* Update tests to account for new promo cards

card_db/en_us/card_groups.json

@@ -83,5 +83,12 @@
             "Settlers"
         ],
         "new_name": "Bustling Village \/ Settlers"
+    },
+    "Sauna \/ Avanto": {
+        "subcards": [
+            "Sauna",
+            "Avanto"
+        ],
+        "new_name": "Sauna \/ Avanto"
     }
 }

card_db/en_us/cards.json

@@ -1583,6 +1583,39 @@
    "Event"
   ]
  },
+ {
+  "cardset": "promo",
+  "cost": "4",
+  "description": "+1 Card\n+1 Action\nYou may play an Avanto from your hand.\nWhile this is in play, when you play a Silver, you may trash a card from your hand.",
+  "extra": "Sauna is a promotional Action card. It's a cantrip that allows you to trash a card when you play a Silver. It is a split pile card, with five copies of Sauna sitting on top of five copies of Avanto.",
+  "name": "Sauna",
+  "potcost": 0,
+  "types":[
+   "Action"
+  ]
+ },
+ {
+  "cardset": "promo",
+  "cost": "5",
+  "description": "+3 Cards\nYou may play a Sauna from your hand.",
+  "extra": "Avanto is a promotional Action card. It's a terminal draw card that can potentially become non-terminal if you have a Sauna in your hand to play. It is a split pile card, with five copies of Avanto sitting under five copies of Sauna.",
+  "name": "Avanto",
+  "potcost": 0,
+  "types":[
+   "Action"
+  ]
+ },
+ {
+  "cardset": "promo",
+  "cost": "4",
+  "description": "Sauna:\n+1 Card\n+1 Action\nYou may play an Avanto from your hand.\nWhile this is in play, when you play a Silver, you may trash a card from your hand.\nAvanto:\n+3 Cards\nYou may play a Sauna from your hand.",
+  "extra": "Sauna \/ Avanto is a split pile with five copies of Sauna placed on top of five copies of Avanto during setup. Sauna is a cantrip that allows you to trash a card when you play a Silver. Avanto is a terminal draw card that can potentially become non-terminal if you have a Sauna in your hand to play.",
+  "name": "Sauna \/ Avanto",
+  "potcost": 0,
+  "types":[
+   "Action"
+  ]
+ },
  {
   "cardset": "base",
   "cost": "0",