add 'flags' key to item script containers

plugin/src/main/java/com/denizenscript/denizen/scripts/containers/core/ItemScriptContainer.java

@@ -2,6 +2,7 @@
 
 import com.denizenscript.denizen.nms.NMSHandler;
 import com.denizenscript.denizen.utilities.Utilities;
+import com.denizenscript.denizencore.flags.AbstractFlagTracker;
 import com.denizenscript.denizencore.objects.ObjectTag;
 import com.denizenscript.denizencore.tags.TagContext;
 import com.denizenscript.denizencore.utilities.CoreUtilities;
@@ -77,6 +78,12 @@ public class ItemScriptContainer extends ScriptContainer {
     //   - enchantment_name:level
     //   - ...
     //
+    //   # You can specify flags to be added to the item.
+    //   flags:
+    //     # Each line within the flags section should be a flag name as a key, and the flag value as the value.
+    //     # You can use lists or maps here the way you would expect them to work.
+    //     my_flag: my_value
+    //
     //   # You can optionally add crafting recipes for your item script.
     //   # Note that recipes won't show in the recipe book when you add a new item script, until you either reconnect or use the "resend_recipes" mechanism.
     //   # | Most item scripts should exclude this key, unless you're specifically building craftable items.
@@ -295,6 +302,14 @@ public ItemTag getItemFrom(TagContext context) {
                 BookScriptContainer book = ScriptRegistry.getScriptContainer(TagManager.tag(getString("book"), context).replace("s@", ""));
                 stack = book.writeBookTo(stack, context);
             }
+            if (contains("flags")) {
+                YamlConfiguration flagSection = getConfigurationSection("flags");
+                AbstractFlagTracker tracker = stack.getFlagTracker();
+                for (StringHolder key : flagSection.getKeys(false)) {
+                    tracker.setFlag(key.str, CoreUtilities.objectToTagForm(flagSection.get(key.str), context, true, true), null);
+                }
+                stack.reapplyTracker(tracker);
+            }
             stack.setItemScript(this);
         }
         catch (Exception e) {