feat: sausage casings can be made with plastic and spawngroups

data/json/itemgroups/Food/food.json

@@ -215,6 +215,8 @@
         "charges-min": 1,
         "charges-max": 9
       },
+      { "item": "sausage_casings", "prob": 5, "charges": [ 10, 50 ] },
+      { "item": "sausage_casings_plastic", "prob": 5, "charges": [ 10, 50 ] },
       { "item": "dry_meat", "prob": 10 },
       { "item": "dry_fish", "prob": 10 },
       { "item": "dry_veggy", "prob": 10 },
@@ -869,6 +871,8 @@
     "entries": [
       { "item": "beer", "prob": 15 },
       { "item": "meat", "prob": 65 },
+      { "item": "sausage_casings", "prob": 5, "charges": [ 10, 50 ] },
+      { "item": "sausage_casings_plastic", "prob": 5, "charges": [ 10, 50 ] },
       { "item": "glazed_tenderloin", "prob": 55 },
       { "item": "fish", "prob": 10 },
       { "item": "fish_smoked", "prob": 5 },

data/json/items/comestibles/offal_dishes.json

@@ -347,6 +347,14 @@
     "material": "flesh",
     "charges": 60
   },
+  {
+    "id": "sausage_casings_plastic",
+    "copy-from": "sausage_casings",
+    "type": "COMESTIBLE",
+    "name": { "str": "artificial sausage casing" },
+    "description": "Sausage casings made from plastic.  Ready to be used for forming meat products.",
+    "material": "plastic"
+  },
   {
     "type": "COMESTIBLE",
     "id": "homemade_hotdogs",

data/json/recipes/food/meat.json

@@ -448,7 +448,7 @@
         [ "seasoning_salt", 4 ],
         [ "pepper", 4 ]
       ],
-      [ [ "sausage_casings", 1 ], [ "stomach", 1 ], [ "stomach_large", 1 ] ]
+      [ [ "sausage_casings", 1 ], [ "sausage_casings_plastic", 1 ], [ "stomach", 1 ], [ "stomach_large", 1 ] ]
     ]
   },
   {
@@ -1545,7 +1545,7 @@
     "tools": [ [ [ "char_smoker", 5 ] ] ],
     "components": [
       [ [ "offals_cooked", 2, "LIST" ], [ "meat_red_cooked", 1, "LIST" ], [ "meat_nofish_raw", 1, "LIST" ] ],
-      [ [ "sausage_casings", 1 ], [ "stomach", 1 ], [ "hstomach", 1 ] ],
+      [ [ "sausage_casings", 1 ], [ "sausage_casings_plastic", 1 ], [ "stomach", 1 ], [ "hstomach", 1 ] ],
       [
         [ "salt_water", 2 ],
         [ "saline", 4 ],
@@ -1577,6 +1577,7 @@
       [ [ "offals_cooked", 4, "LIST" ], [ "meat_red_cooked", 2, "LIST" ], [ "meat_nofish_raw", 2, "LIST" ] ],
       [
         [ "sausage_casings", 2 ],
+        [ "sausage_casings_plastic", 2 ],
         [ "stomach", 2 ],
         [ "stomach_large", 1 ],
         [ "hstomach", 2 ],
@@ -1625,7 +1626,7 @@
     "qualities": [ { "id": "CUT", "level": 1 }, { "id": "COOK", "level": 1 } ],
     "components": [
       [ [ "offals_cooked", 2, "LIST" ], [ "meat_red_cooked", 1, "LIST" ], [ "meat_nofish_raw", 1, "LIST" ] ],
-      [ [ "sausage_casings", 1 ], [ "stomach", 1 ], [ "hstomach", 1 ] ],
+      [ [ "sausage_casings", 1 ], [ "sausage_casings_plastic", 1 ], [ "stomach", 1 ], [ "hstomach", 1 ] ],
       [
         [ "salt_water", 2 ],
         [ "saline", 4 ],
@@ -1656,6 +1657,7 @@
       [ [ "offals_cooked", 4, "LIST" ], [ "meat_red_cooked", 2, "LIST" ], [ "meat_nofish_raw", 2, "LIST" ] ],
       [
         [ "sausage_casings", 2 ],
+        [ "sausage_casings_plastic", 2 ],
         [ "stomach", 2 ],
         [ "stomach_large", 1 ],
         [ "hstomach", 2 ],
@@ -2552,20 +2554,33 @@
     "category": "CC_FOOD",
     "subcategory": "CSC_FOOD_MEAT",
     "skill_used": "cooking",
-    "difficulty": 5,
+    "difficulty": 3,
     "time": "50 m",
     "batch_time_factors": [ 80, 5 ],
     "charges": 20,
+    "autolearn": [ [ "cooking", 5 ] ],
     "//": "Charcuterie: The Craft of Salting, Smoking, and Curing would be a good book for someone to use for further meat products recipes.",
-    "book_learn": [ [ "survival_book", 4 ], [ "family_cookbook", 4 ], [ "offalcooking", 3 ] ],
+    "book_learn": [ [ "survival_book", 3 ], [ "family_cookbook", 3 ], [ "offalcooking", 2 ] ],
     "qualities": [ { "id": "COOK", "level": 2 }, { "id": "CUT_FINE", "level": 1 } ],
     "tools": [ [ [ "funnel", -1 ] ] ],
-    "components": [
-      [ [ "stomach", 2 ], [ "stomach_large", 1 ] ],
-      [ [ "salt", 20 ] ],
-      [ [ "water", 2 ], [ "water_clean", 2 ] ],
-      [ [ "bag_plastic", 1 ] ]
-    ]
+    "components": [ [ [ "stomach", 1 ], [ "stomach_large", 1 ] ], [ [ "salt", 20 ] ], [ [ "water", 2 ], [ "water_clean", 2 ] ] ]
+  },
+  {
+    "type": "recipe",
+    "result": "sausage_casings_plastic",
+    "category": "CC_FOOD",
+    "subcategory": "CSC_FOOD_MEAT",
+    "skill_used": "cooking",
+    "skills_required": [ "fabrication", 2 ],
+    "difficulty": 3,
+    "time": "30 m",
+    "batch_time_factors": [ 80, 5 ],
+    "charges": 20,
+    "autolearn": [ [ "cooking", 5 ], [ "fabrication", 2 ] ],
+    "book_learn": [ [ "survival_book", 3 ], [ "family_cookbook", 3 ], [ "offalcooking", 2 ] ],
+    "qualities": [ { "id": "COOK", "level": 2 }, { "id": "CUT_FINE", "level": 1 } ],
+    "tools": [ [ [ "surface_heat", 5, "LIST" ] ] ],
+    "components": [ [ [ "bag_plastic", 1 ] ] ]
   },
   {
     "type": "recipe",