Initial implementation of fishing system. A couple bugs fixed, e.g. zombies that are killed by residents actually die.

src/constants.nvgt

@@ -25,6 +25,8 @@ const int BLESSING_BARRICADE_REPAIR = 20;
 const int BLESSING_SPEED_DURATION = 300000;
 const int BLESSING_TRIGGER_CHANCE = 10;
 const int BLESSING_WALK_SPEED = 320;
+const int FISH_WEIGHT_MIN = 1;
+const int FISH_WEIGHT_MAX = 30;
 
 // Weapon damage
 const int SPEAR_DAMAGE = 3;
@@ -172,6 +174,8 @@ const int RESIDENT_SLING_DAMAGE_MIN = 3;
 const int RESIDENT_SLING_DAMAGE_MAX = 5;
 const int RESIDENT_SNARE_ESCAPE_CHANCE = 5;  // 5% chance game escapes when resident retrieves
 const int RESIDENT_SNARE_CHECK_CHANCE = 15;  // 15% chance per hour to check snares
+const int RESIDENT_FISHING_CHANCE = 6;  // 6% chance per resident per hour to catch a fish
+const int RESIDENT_SMOKE_FISH_CHANCE = 10;  // 10% chance per hour to smoke a stored fish
 
 // Goose settings
 const int GOOSE_HEALTH = 1;