Game as the Core mod: data-driven content and localization

The whole game is now described by Mods/Core — the first consumer of
the engine's new MrGameEng.Mods module:

- textures/ moved to Mods/Core/Textures; atlases are built at game
  start from the merged texture tree of all active mods into Cache/
  (gitignored, incremental) instead of being committed, and the
  GameAssets atlas handles are gone with them
- terrain, plants and pawns are JSON defs (Mods/Core/Defs) with parent
  inheritance; scenes read TerrainDef/PlantDef/PawnDef instead of
  hardcoded arrays, and the TerrainKind enum is retired
- HUD strings come from Mods/Core/Languages (ru default, en fallback)
  through LanguageManager; the language switches at runtime
- new console commands: mods, lang [code], defs [type]; atlas now
  inspects the runtime-built cache
- bump engine: MrGameEng.Mods module and the explicit-sources
  AtlasBuilder overload

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Mods/Core/Defs/pawns.json

@@ -0,0 +1,22 @@
+{
+  "type": "Pawn",
+  "defs": [
+    { "defName": "BaseBeing", "abstract": true, "kind": "being", "sizeCells": 1.1 },
+    { "defName": "BeingMale",   "parent": "BaseBeing", "label": "pawn.being", "texture": "things/pawn/humanlike/bodies/FurCovered_Male_south" },
+    { "defName": "BeingFemale", "parent": "BaseBeing", "label": "pawn.being", "texture": "things/pawn/humanlike/bodies/FurCovered_Female_south" },
+    { "defName": "BeingThin",   "parent": "BaseBeing", "label": "pawn.being", "texture": "things/pawn/humanlike/bodies/FurCovered_Thin_south" },
+    { "defName": "BeingFat",    "parent": "BaseBeing", "label": "pawn.being", "texture": "things/pawn/humanlike/bodies/FurCovered_Fat_south" },
+    { "defName": "BeingHulk",   "parent": "BaseBeing", "label": "pawn.being", "texture": "things/pawn/humanlike/bodies/FurCovered_Hulk_south" },
+
+    { "defName": "BaseAnimal", "abstract": true, "kind": "animal" },
+    { "defName": "Bear",     "parent": "BaseAnimal", "label": "pawn.bear",     "texture": "things/pawn/animal/bear/Bear_east",             "sizeCells": 1.7 },
+    { "defName": "DeerDoe",  "parent": "BaseAnimal", "label": "pawn.deer",     "texture": "things/pawn/animal/deer/DeerFemale_east",       "sizeCells": 1.4 },
+    { "defName": "DeerBuck", "parent": "BaseAnimal", "label": "pawn.deer",     "texture": "things/pawn/animal/deer/DeerMale_east",         "sizeCells": 1.6 },
+    { "defName": "FoxRed",   "parent": "BaseAnimal", "label": "pawn.fox",      "texture": "things/pawn/animal/fox_red/Fox_Red_east",       "sizeCells": 1.0 },
+    { "defName": "Hare",     "parent": "BaseAnimal", "label": "pawn.hare",     "texture": "things/pawn/animal/hare/Hare_east",             "sizeCells": 0.7 },
+    { "defName": "WildBoar", "parent": "BaseAnimal", "label": "pawn.boar",     "texture": "things/pawn/animal/wildboar/WildBoar_east",     "sizeCells": 1.2 },
+    { "defName": "Wolf",     "parent": "BaseAnimal", "label": "pawn.wolf",     "texture": "things/pawn/animal/wolf_timber/Wolf_Timber_east", "sizeCells": 1.4 },
+    { "defName": "Muffalo",  "parent": "BaseAnimal", "label": "pawn.muffalo",  "texture": "things/pawn/animal/muffalo/Muffalo_east",       "sizeCells": 1.8 },
+    { "defName": "Squirrel", "parent": "BaseAnimal", "label": "pawn.squirrel", "texture": "things/pawn/animal/squirrel/Squirrel_east",     "sizeCells": 0.6 }
+  ]
+}

Mods/Core/Defs/plants.json

@@ -0,0 +1,17 @@
+{
+  "type": "Plant",
+  "defs": [
+    { "defName": "BaseTree", "abstract": true, "sizeCells": 2.0, "trunkRadiusCells": 0.28 },
+    { "defName": "TreeOakA",      "parent": "BaseTree", "label": "plant.oak",   "texture": "things/plant/treeoak/TreeOakA" },
+    { "defName": "TreeOakB",      "parent": "BaseTree", "label": "plant.oak",   "texture": "things/plant/treeoak/TreeOakB" },
+    { "defName": "TreeBirchA",    "parent": "BaseTree", "label": "plant.birch", "texture": "things/plant/treebirch/TreeBirchA" },
+    { "defName": "TreeGrayPineA", "parent": "BaseTree", "label": "plant.pine",  "texture": "things/plant/treegraypine/TreeGrayPineA" },
+
+    { "defName": "GrassA", "label": "plant.grass", "texture": "things/plant/grass/grassa", "sizeCells": 1.2 },
+
+    { "defName": "BaseBush", "abstract": true, "label": "plant.bush", "sizeCells": 1.4 },
+    { "defName": "BushA", "parent": "BaseBush", "texture": "things/plant/bush/BushA" },
+    { "defName": "BushB", "parent": "BaseBush", "texture": "things/plant/bush/BushB" },
+    { "defName": "BushC", "parent": "BaseBush", "texture": "things/plant/bush/BushC" }
+  ]
+}

Mods/Core/Defs/terrain.json

@@ -0,0 +1,22 @@
+{
+  "type": "Terrain",
+  "defs": [
+    { "defName": "DeepWater", "label": "terrain.deepwater", "maxHeight": 0.30, "color": [23, 63, 95] },
+    { "defName": "Water",     "label": "terrain.water",     "maxHeight": 0.42, "color": [32, 99, 155] },
+    { "defName": "Sand",      "label": "terrain.sand",      "maxHeight": 0.48, "color": [237, 201, 120],
+      "isLand": true, "surface": "terrain/surfaces/sand" },
+    { "defName": "Grass",     "label": "terrain.grass",     "maxHeight": 0.68, "color": [90, 160, 70],
+      "isLand": true, "surface": "terrain/surfaces/mossy",
+      "scatter": [
+        { "chance": 0.35, "options": ["GrassA"] },
+        { "chance": 0.07, "options": ["BushA", "BushB", "BushC"] }
+      ] },
+    { "defName": "Forest",    "label": "terrain.forest",    "maxHeight": 0.85, "color": [44, 110, 50],
+      "isLand": true, "surface": "terrain/surfaces/soil",
+      "scatter": [
+        { "chance": 0.35, "options": ["TreeOakA", "TreeOakB", "TreeBirchA", "TreeGrayPineA"] }
+      ] },
+    { "defName": "Mountain",  "label": "terrain.mountain",  "maxHeight": 1.01, "color": [136, 132, 128],
+      "surface": "terrain/surfaces/roughhewnrock" }
+  ]
+}