Added API for manipulating map items. Thanks SpaceManiac, codename_B, sk89q and dested!

By: EvilSeph <evilseph@gmail.com>

paper-api/src/main/java/org/bukkit/event/Event.java

@@ -487,6 +487,12 @@ public abstract class Event implements Serializable {
          * @see org.bukkit.event.server.ServerCommandEvent
          */
         SERVER_COMMAND (Category.SERVER),
+        /**
+         * Called when a map is initialized (created or loaded into memory)
+         * 
+         * @see org.bukkit.event.server.MapInitializeEvent
+         */
+        MAP_INITIALIZE (Category.SERVER),
 
         /**
          * WORLD EVENTS

paper-api/src/main/java/org/bukkit/event/server/MapInitializeEvent.java

@@ -0,0 +1,25 @@
+package org.bukkit.event.server;
+
+import org.bukkit.event.Event;
+import org.bukkit.map.MapView;
+
+/**
+ * Called when a map is initialized.
+ */
+public class MapInitializeEvent extends ServerEvent {
+    private final MapView mapView;
+    
+    public MapInitializeEvent(MapView mapView) {
+        super(Event.Type.MAP_INITIALIZE);
+        this.mapView = mapView;
+    }
+    
+    /**
+     * Gets the map initialized in this event.
+     * 
+     * @return Map for this event
+     */
+    public MapView getMap() {
+        return mapView;
+    }
+}

paper-api/src/main/java/org/bukkit/event/server/ServerListener.java

@@ -27,4 +27,11 @@ public class ServerListener implements Listener {
      * @param event Relevant event details
      */
     public void onServerCommand(ServerCommandEvent event) {}
+    
+    /**
+     * Called when a map item is initialized (created or loaded into memory)
+     * 
+     * @param event Relevant event details
+     */
+    public void onMapInitialize(MapInitializeEvent event) {}
 }