Enhance CLI functionality with palette support and update exporters to use BlockPalette

palettes/default.json

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+{
+  "name": "Default",
+  "author": null,
+  "blocks": {
+    "body": "minecraft:quartz_block",
+    "outline": "minecraft:obsidian",
+    "shadow": null
+  }
+}

palettes/gold.json

@@ -0,0 +1,9 @@
+{
+  "name": "Gold",
+  "author": null,
+  "blocks": {
+    "body": "minecraft:gold_block",
+    "outline": "minecraft:deepslate",
+    "shadow": null
+  }
+}

palettes/ocean.json

@@ -0,0 +1,9 @@
+{
+  "name": "Ocean",
+  "author": null,
+  "blocks": {
+    "body": "minecraft:blue_concrete",
+    "outline": "minecraft:white_concrete",
+    "shadow": "minecraft:gray_concrete"
+  }
+}

palettes/stone.json

@@ -0,0 +1,9 @@
+{
+  "name": "Stone",
+  "author": null,
+  "blocks": {
+    "body": "minecraft:stone",
+    "outline": "minecraft:cobblestone",
+    "shadow": null
+  }
+}