Datapack export

- /iris datapack export compiles one pack dimension into a worldgen datapack for Minecraft 26.3 and later
- Bukkit and mod loaders take the same version, mode, namespace, output, format, objects and replace arguments
- The default overworld mode replaces the Overworld of a new world with the default world type
- Preset and dimension modes write a selectable world preset or a separate dimension
- The export runs in the background and publishes the zip or folder atomically
- Pack compiler stages turn noise, terrain, caves, subterrain, biomes, surface, decoration, objects and structures into a version-neutral IR
- Capability lowering fits every field to 26.3 density function ranges
- Disjoint min and max nodes fold to the input that always wins
- The 26.3 writer emits density functions, noise settings, biomes, features, structures, presets and dimensions
- Every export carries the Iris logo as its pack.png
- Unused objects, templates and features are pruned from the output
- The pruner keeps pack.png without reading references from its bytes
- Imported pack datapacks are bundled into the export
- Every approximation reports an export limit diagnostic
- Generation cost is counted against a node budget and reported as a warning
- Cave biomes over the wall palette limit use the closest kept palette
- Jigsaw exports share the template encoder, block states, destinations and publisher with the worldgen export
- DataVersion carries the pack format minor and world data version
- Both platforms expose vanilla data from the server classpath
- GoldenHashEngine and the export probes share one chunk spiral scan
- Headless 26.3 probes measure export cost and compare column and chunk likeness against Iris
- Real-codec tests decode the exported resources with the 26.3 registries
- Paper registry tests run in isolated registry scopes
- Command help and messages cover the export in every language file

core/build.gradle

@@ -193,6 +193,10 @@ tasks.named('test').configure {
     maxHeapSize = '2g'
     jvmArgs('-XX:+ExitOnOutOfMemoryError')
     systemProperty('iris.generation.counters', 'true')
+    String exportProbePack = providers.gradleProperty('iris.exportProbePack').orNull
+    if (exportProbePack != null) {
+        systemProperty('iris.exportProbePack', exportProbePack)
+    }
 }
 
 java {
@@ -360,14 +364,9 @@ List<String> unusedVolmLibPackages = [
 ]
 
 List<String> unusedVolmLibClasses = [
-    'art/arcane/volmlib/util/nbt/io/ParseException',
-    'art/arcane/volmlib/util/nbt/io/SNBTDeserializer',
-    'art/arcane/volmlib/util/nbt/io/SNBTParser',
     'art/arcane/volmlib/util/nbt/io/SNBTSerializer',
     'art/arcane/volmlib/util/nbt/io/SNBTUtil',
     'art/arcane/volmlib/util/nbt/io/SNBTWriter',
-    'art/arcane/volmlib/util/nbt/io/StringPointer',
-    'art/arcane/volmlib/util/io/StringDeserializer',
     'art/arcane/volmlib/util/io/StringSerializer',
     'art/arcane/volmlib/util/json/EnumType',
     'art/arcane/volmlib/util/json/HTTP',