Read custom_model_data field from item mappings

Closes #525

common/src/main/java/com/viaversion/viabackwards/api/data/MappedItem.java

@@ -18,15 +18,22 @@
 package com.viaversion.viabackwards.api.data;
 
 import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.ChatRewriter;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class MappedItem {
 
     private final int id;
     private final String jsonName;
+    private final Integer customModelData;
 
-    public MappedItem(int id, String name) {
+    public MappedItem(final int id, final String name) {
+        this(id, name, null);
+    }
+
+    public MappedItem(final int id, final String name, @Nullable final Integer customModelData) {
         this.id = id;
-        this.jsonName = ChatRewriter.legacyTextToJsonString("§f" + name);
+        this.jsonName = ChatRewriter.legacyTextToJsonString("§f" + name, true);
+        this.customModelData = customModelData;
     }
 
     public int getId() {
@@ -36,4 +43,8 @@ public class MappedItem {
     public String getJsonName() {
         return jsonName;
     }
+
+    public @Nullable Integer customModelData() {
+        return customModelData;
+    }
 }

common/src/main/java/com/viaversion/viabackwards/api/data/VBMappingDataLoader.java

@@ -162,7 +162,8 @@ public final class VBMappingDataLoader {
             }
 
             String name = object.getAsJsonPrimitive("name").getAsString();
-            itemMapping.put(oldId, new MappedItem(mappedId, name));
+            JsonPrimitive customModelData = object.getAsJsonPrimitive("custom_model_data");
+            itemMapping.put(oldId, new MappedItem(mappedId, name, customModelData != null ? customModelData.getAsInt() : null));
         }
 
         // Look for missing keys

common/src/main/java/com/viaversion/viabackwards/api/rewriters/ItemRewriter.java

@@ -88,6 +88,11 @@ public abstract class ItemRewriter<T extends BackwardsProtocol> extends ItemRewr
         item.tag().put(nbtTagName + "|id", new IntTag(item.identifier()));
         item.setIdentifier(data.getId());
 
+        // Add custom model data
+        if (data.customModelData() != null && !item.tag().contains("CustomModelData")) {
+            item.tag().put("CustomModelData", new IntTag(data.customModelData()));
+        }
+
         // Set custom name - only done if there is no original one
         if (display == null) {
             item.tag().put("display", display = new CompoundTag());

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19_3to1_19_4/data/EntityPackets1_19_4.java

@@ -20,10 +20,8 @@ package com.viaversion.viabackwards.protocol.protocol1_19_3to1_19_4.data;
 import com.viaversion.viabackwards.protocol.protocol1_19_3to1_19_4.Protocol1_19_3To1_19_4;
 import com.viaversion.viaversion.api.minecraft.entities.Entity1_19_3Types;
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
-import com.viaversion.viaversion.api.minecraft.nbt.BinaryTagIO;
 import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
 import com.viaversion.viaversion.api.type.Type;
-import com.viaversion.viaversion.libs.opennbt.NBTIO;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.ByteTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.ListTag;