Migrate zombie survivor drops

data/json/monster_drops.json

@@ -313,35 +313,5 @@
            {"item": "marloss_gel"},
            {"item": "fungal_seeds"}
        ]
    },
    {
        "type" : "item_group",
        "subtype": "collection",
        "id": "mon_zombie_survivor_death_drops",
        "entries":
        [
            { "group": "pants", "damage": [1, 4] },
            { "group": "shirts", "damage": [1, 4] },
            { "group": "shoes", "damage": [1, 4] },
            { "group": "jackets", "damage": [1, 4], "prob": 20 },
            { "group": "bags", "damage": [1, 4], "prob": 6 },
            { "distribution": [
                { "group": "allguns", "prob": 24 },
                { "group": "grenades", "prob": 10 },
                { "group": "mil_rifles", "prob": 8 },
                { "group": "mil_hw", "prob": 1 },
                { "group": "launchers", "prob": 1 },
                { "group": "gunxtras", "prob": 14 },
                { "group": "stash_food", "prob": 40 },
                { "group": "stash_ammo", "prob": 26 },
                { "group": "stash_drugs", "prob": 28 },
                { "group": "survival_tools", "prob": 18 },
                { "group": "mil_food", "prob": 22 },
                { "group": "mil_food_nodrugs", "prob": 34 },
                { "group": "shelter", "prob": 8 },
                { "group": "mil_surplus", "prob": 6 }
            ] },
            { "item": "cash_card" }
        ]
    }
]

data/json/monsterdrops/zombie_survivor.json

@@ -0,0 +1,18 @@
[
  {
    "type" : "item_group",
    "subtype": "collection",
    "id": "mon_zombie_survivor_death_drops",
    "entries": [
      { "group": "clothing_outdoor_set", "damage": [1,4] },
      { "group": "bags", "damage": [1,4], "prob": 10 },
      { "distribution": [
        { "group": "book_survival", "prob": 25 },
        { "group": "gear_survival", "prob": 25, "damage": [ 1, 4 ] },
        { "group": "guns_survival", "prob": 25, "damage": [ 1, 4 ] },
        { "group": "stash_food", "prob": 40 }
      ] },
      { "item": "cash_card" }
    ]
  }
]