feat(assets): add normal maps and item/creature definitions

Add normal map references to block JSONs, add creature definitions for pig and player, and create item definitions. Move models and normal textures into the cubed asset namespace, replacing legacy item files.

assets/cubed/items/air.json

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+{
+    "name": "air",
+    "type": "block",
+    "block": "cubed:air",
+    "texture": "cubed:textures/items/block/air.png",
+    "description": ""
+}

assets/cubed/items/dirt.json

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+{
+    "name": "dirt",
+    "type": "block",
+    "block": "cubed:dirt",
+    "texture": "cubed:textures/items/block/dirt.png",
+    "description": ""
+}

assets/cubed/items/grass.json

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+{
+    "name": "grass",
+    "type": "block",
+    "block": "cubed:grass",
+    "texture": "cubed:textures/items/block/grass.png",
+    "description": ""
+}

assets/cubed/items/grass_block.json

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+{
+    "name": "grass_block",
+    "type": "block",
+    "block": "cubed:grass_block",
+    "texture": "cubed:textures/items/block/grass_block.png",
+    "description": ""
+}

assets/cubed/items/leaf.json

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+{
+    "name": "leaf",
+    "type": "block",
+    "block": "cubed:leaf",
+    "texture": "cubed:textures/items/block/leaf.png",
+    "description": ""
+}

assets/cubed/items/log.json

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+{
+    "name": "log",
+    "type": "block",
+    "block": "cubed:log",
+    "texture": "cubed:textures/items/block/log.png",
+    "description": ""
+}

assets/cubed/items/pig_spawn_egg.json

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+{
+    "name": "pig_spawn_egg",
+    "type": "spawn_egg",
+    "creature": "cubed:pig",
+    "texture": "cubed:textures/items/spawn_egg/pig_spawn_egg.png",
+    "description": ""
+}

assets/cubed/items/sand.json

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+{
+    "name": "sand",
+    "type": "block",
+    "block": "cubed:sand",
+    "texture": "cubed:textures/items/block/sand.png",
+    "description": ""
+}

assets/cubed/items/snowy_grass_block.json

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+{
+    "name": "snowy_grass_block",
+    "type": "block",
+    "block": "cubed:snowy_grass_block",
+    "texture": "cubed:textures/items/block/snowy_grass_block.png",
+    "description": ""
+}

assets/cubed/items/stone.json

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+{
+    "name": "stone",
+    "type": "block",
+    "block": "cubed:stone",
+    "texture": "cubed:textures/items/block/stone.png",
+    "description": ""
+}

assets/cubed/items/water.json

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+{
+    "name": "water",
+    "type": "block",
+    "block": "cubed:water",
+    "texture": "cubed:textures/items/block/water.png",
+    "description": ""
+}