Add ItemMergeEvent

By: Morphan1 <morphanone@gmail.com>

paper-api/src/main/java/org/bukkit/event/entity/ItemMergeEvent.java

@@ -0,0 +1,50 @@
+package org.bukkit.event.entity;
+
+import org.bukkit.entity.Item;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+
+public class ItemMergeEvent extends EntityEvent implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+    private boolean cancelled;
+    private final Item target;
+
+    public ItemMergeEvent(Item item, Item target) {
+        super(item);
+        this.target = target;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancelled) {
+        this.cancelled = cancelled;
+    }
+
+    @Override
+    public Item getEntity() {
+        return (Item) entity;
+    }
+
+    /**
+     * Gets the Item entity the main Item is being merged into.
+     *
+     * @return The Item being merged with
+     */
+    public Item getTarget() {
+        return target;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}