Make players assume ownership of networks when they place security stations onto unsecured ones (#4714)

* Fixes #4712: When a security station is placed onto an unsecured network, the placer assumes ownership of the entire network. Otherwise the contiguous network would not necessarily reconnect in the same way when the chunk is reloaded due to differing player-ids throughout the network.
In addition, changes to the node's owner were not being persisted due to the host never being marked as dirty.

* Fix formatting

src/api/java/appeng/api/networking/GridNotification.java

@@ -28,4 +28,9 @@ public enum GridNotification {
      * the visible connections for this node have changed, useful for cable.
      */
     CONNECTIONS_CHANGED,
+
+    /**
+     * the owner of the grid node has changed, and the node needs to be re-saved
+     */
+    OWNER_CHANGED
 }

src/api/java/appeng/api/networking/IGridBlock.java

@@ -87,7 +87,8 @@ public interface IGridBlock {
     AEColor getGridColor();
 
     /**
-     * Notifies your IGridBlock that changes were made to your connections
+     * Called by the {@link IGridNode} to notify its {@link IGridBlock} about
+     * events.
      */
     void onGridNotification(@Nonnull GridNotification notification);