Added INVENTORY_OPEN as a player event

By: Dinnerbone <dinnerbone@dinnerbone.com>

paper-api/src/main/java/org/bukkit/event/player/PlayerInventoryEvent.java

@@ -0,0 +1,26 @@
+
+package org.bukkit.event.player;
+
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.Inventory;
+
+/**
+ * Represents a player related inventory event
+ */
+public class PlayerInventoryEvent extends PlayerEvent {
+    protected Inventory inventory;
+
+    public PlayerInventoryEvent(final Type type, final Player player, final Inventory inventory) {
+        super(type, player);
+        this.inventory = inventory;
+    }
+
+    /**
+     * Gets the Inventory involved in this event
+     *
+     * @return Inventory
+     */
+    public Inventory getInventory() {
+        return inventory;
+    }
+}

paper-api/src/main/java/org/bukkit/event/player/PlayerListener.java

@@ -89,4 +89,12 @@ public class PlayerListener implements Listener {
      */
     public void onPlayerAnimation(PlayerAnimationEvent event) {
     }
+
+    /**
+     * Called when a player opens an inventory
+     *
+     * @param event Relevant event details
+     */
+    public void onInventoryOpen(PlayerInventoryEvent event) {
+    }
 }