Add CustomModelData option for itemInfo(ItemStack is)

Add support of the CustomModelData for ItemStack in itemInfo(ItemStack is)
Add private static int getItemCustomModelData(ItemStack is) to get the customModelData of an item (default return 0)

src/main/java/com/gmail/St3venAU/plugins/ArmorStandTools/Utils.java

@@ -166,6 +166,11 @@ class Utils {
         }
         return tags.length() == 0 ? "" : tags.toString();
     }
+    
+    static private int getItemCustomModelData(ItemStack is) {
+        if(is == null || is.getItemMeta() == null || is.getItemMeta().getCustomModelData() == null) return 0;
+        return is.getItemMeta().getCustomModelData();
+    }
 
     static private String skullOwner(ItemStack is) {
         if(is == null || is.getItemMeta() == null || !(is.getItemMeta() instanceof SkullMeta skull)) return "";
@@ -187,6 +192,7 @@ class Utils {
         @SuppressWarnings("deprecation")
         short durability = is.getDurability();
         String skullOwner = skullOwner(is);
+        int customModelData = getItemCustomModelData(is);
         int n = 0;
         if(itemStackTags.length() > 0 || durability > 0 || skullOwner.length() > 0) {
             sb.append(",tag:{");
@@ -194,6 +200,11 @@ class Utils {
                 sb.append("Damage:").append(durability);
                 n++;
             }
+            if(customModelData > 0) {
+                if(n > 0) sb.append(",");
+                sb.append("CustomModelData:").append(customModelData);
+                n++;
+            }
             if(itemStackTags.length() > 0) {
                 if(n > 0) sb.append(",");
                 sb.append(itemStackTags);