Include the trench pig

Add another death_drop group for zombie beasts that explode and give it to the trench pig.

data/json/monsterdrops/zombie.json

@@ -178,6 +178,23 @@
       { "item": "sinew", "prob": 50, "damage": [ 2, 3 ], "count": [ 5, 10 ] }
     ]
   },
+  {
+    "type": "item_group",
+    "id": "explode_zed_beast",
+    "subtype": "collection",
+    "entries": [
+      { "item": "leg_zed", "prob": 80, "damage": [ 2, 3 ], "count": [ 1, 2 ] },
+      { "item": "leg_zed", "prob": 40, "damage": [ 2, 3 ], "count": [ 1, 2 ] },
+      { "item": "raw_tainted_leather", "prob": 100, "damage": [ 2, 3 ], "count": [ 5, 10 ] },
+      { "item": "blood_tainted", "prob": 100, "damage": [ 2, 3 ], "count": [ 5, 10 ] },
+      { "item": "meat_tainted", "prob": 100, "damage": [ 2, 3 ], "count": [ 5, 10 ] },
+      { "item": "fat_tainted", "prob": 80, "damage": [ 2, 3 ], "count": [ 1, 5 ] },
+      { "item": "bone_tainted", "prob": 100, "damage": [ 2, 3 ], "count": [ 5, 10 ] },
+      { "item": "tainted_marrow", "prob": 50, "damage": [ 2, 3 ], "count": [ 1, 5 ] },
+      { "item": "tainted_innards", "prob": 100, "damage": [ 2, 3 ], "count": [ 5, 10 ] },
+      { "item": "sinew", "prob": 50, "damage": [ 2, 3 ], "count": [ 5, 10 ] }
+    ]
+  },
   {
     "type": "item_group",
     "id": "explode_gasbag",

data/json/monsters/zanimal_upgrade.json

@@ -241,6 +241,7 @@
     "harvest": "exempt",
     "emit_fields": [ { "emit_id": "emit_tear_gas_stream", "delay": "1 s" } ],
     "death_function": { "effect": { "id": "death_tearburst", "hit_self": true }, "message": "The %s explodes!", "corpse_type": "NO_CORPSE" },
+    "death_drops": "explode_zed_beast",
     "special_attacks": [ { "id": "impale" } ],
     "extend": { "flags": [ "HIT_AND_RUN" ] }
   },