Wolves with a den, fishing, and a mixed diet

Wolves
- Den: a boulder cave at the foot of the rim, sited from the seed (away
  from the sea and spawn, mouth toward the valley, clearing in front)
- Grace period: no wolves days 1-2; they move in on day 3 and howl; hunting
  from night 4; pack of 2, 3 from day 6, 4 from day 9; replaced by day
- Wary pack hunters: circle and dart in one at a time; a lit campfire is a
  safe zone, a torch makes them hesitate, walls block bites (line of
  sight); hit one and the pack turns; hurt wolves flee; a lone wolf is
  timid; by day they defend the den; home at dawn
- Glowing eyes, synthesised howls, can't sleep with wolves prowling
- Wolf pelt and Wolf Cloak (+25 warmth)
- Animals take a committed detour around obstacles

Fishing
- Fishing rod (workbench); cast a float onto the lake, 1.5 s to land a bite
- Perch and rarer trout; faster bites at dawn/dusk and in rain; grill them
- Visible fish near the shore that jump with splash rings

Mixed diet
- Foods belong to meat, fish or greens; each level runs down over ~1.5 days
- One group low: no healing; two low: Malnourished (health drains);
  all three good: Balanced diet (heal x1.5); HUD diet bars; saved

Tests: test_wolves and test_fishing_diet; run_all.sh covers 9 suites

data/items.json

@@ -137,7 +137,10 @@
       "mesh": "berries",
       "food": {
         "hunger": 9,
-        "health": 2
+        "health": 2,
+        "diet": {
+          "plants": 14
+        }
       }
     },
     {
@@ -149,7 +152,10 @@
       "mesh": "mushroom",
       "food": {
         "hunger": 6,
-        "health": 0
+        "health": 0,
+        "diet": {
+          "plants": 10
+        }
       }
     },
     {
@@ -161,7 +167,10 @@
       "mesh": "roasted_mushroom",
       "food": {
         "hunger": 24,
-        "health": 8
+        "health": 8,
+        "diet": {
+          "plants": 30
+        }
       }
     },
     {
@@ -277,7 +286,10 @@
       "mesh": "raw_meat",
       "food": {
         "hunger": 5,
-        "health": -4
+        "health": -4,
+        "diet": {
+          "meat": 8
+        }
       }
     },
     {
@@ -290,6 +302,9 @@
       "food": {
         "hunger": 34,
         "health": 12,
+        "diet": {
+          "meat": 40
+        },
         "buff": {
           "id": "well_fed",
           "name": "Well fed",
@@ -374,6 +389,98 @@
         "warmth": 15,
         "wet_chill": 0.6
       }
+    },
+    {
+      "id": "wolf_pelt",
+      "name": "Wolf Pelt",
+      "category": "resource",
+      "stack": 20,
+      "description": "Thick grey fur. The warmest thing on the island.",
+      "mesh": "wolf_pelt"
+    },
+    {
+      "id": "wolf_cloak",
+      "name": "Wolf Cloak",
+      "category": "tool",
+      "stack": 1,
+      "description": "Right-click to wear it (+25 warmth, wet barely chills you). Take it off from the inventory screen.",
+      "mesh": "wolf_cloak",
+      "wear": {
+        "warmth": 25,
+        "wet_chill": 0.35
+      }
+    },
+    {
+      "id": "fishing_rod",
+      "name": "Fishing Rod",
+      "category": "tool",
+      "stack": 1,
+      "description": "LMB casts into the lake. When the float dips, click quickly to land the fish.",
+      "mesh": "fishing_rod",
+      "fishing": {
+        "cast_speed": 12.0,
+        "stamina": 4
+      }
+    },
+    {
+      "id": "perch",
+      "name": "Perch",
+      "category": "food",
+      "stack": 20,
+      "description": "A small lake fish. Grill it at a campfire. (Fish)",
+      "mesh": "perch",
+      "food": {
+        "hunger": 4,
+        "health": -2,
+        "diet": {
+          "fish": 8
+        }
+      }
+    },
+    {
+      "id": "trout",
+      "name": "Trout",
+      "category": "food",
+      "stack": 20,
+      "description": "A fine, fat lake trout. Bites best at dawn and dusk. (Fish)",
+      "mesh": "trout",
+      "food": {
+        "hunger": 6,
+        "health": -2,
+        "diet": {
+          "fish": 12
+        }
+      }
+    },
+    {
+      "id": "grilled_perch",
+      "name": "Grilled Perch",
+      "category": "food",
+      "stack": 20,
+      "description": "Flaky and good. (Fish)",
+      "mesh": "grilled_perch",
+      "food": {
+        "hunger": 18,
+        "health": 6,
+        "diet": {
+          "fish": 30
+        }
+      }
+    },
+    {
+      "id": "grilled_trout",
+      "name": "Grilled Trout",
+      "category": "food",
+      "stack": 20,
+      "description": "Rich and filling. (Fish)",
+      "mesh": "grilled_trout",
+      "food": {
+        "hunger": 28,
+        "health": 10,
+        "diet": {
+          "fish": 45
+        }
+      }
     }
   ]
 }

data/recipes.json

@@ -185,6 +185,46 @@
         "hide": 4,
         "fiber": 4
       }
+    },
+    {
+      "id": "wolf_cloak",
+      "output": "wolf_cloak",
+      "count": 1,
+      "station": "workbench",
+      "inputs": {
+        "wolf_pelt": 3,
+        "hide": 2,
+        "fiber": 4
+      }
+    },
+    {
+      "id": "fishing_rod",
+      "output": "fishing_rod",
+      "count": 1,
+      "station": "workbench",
+      "inputs": {
+        "stick": 2,
+        "fiber": 3,
+        "flint": 1
+      }
+    },
+    {
+      "id": "grilled_perch",
+      "output": "grilled_perch",
+      "count": 1,
+      "station": "campfire",
+      "inputs": {
+        "perch": 1
+      }
+    },
+    {
+      "id": "grilled_trout",
+      "output": "grilled_trout",
+      "count": 1,
+      "station": "campfire",
+      "inputs": {
+        "trout": 1
+      }
     }
   ]
 }