feat(sdk): make client closeable

Author: xeruf

sdk/src/server-api/sc/networking/clients/IClient.java

@@ -2,8 +2,10 @@
 
 import sc.protocol.ProtocolPacket;
 
+import java.io.Closeable;
+
 /** Client interface to send packages to the server. */
-public interface IClient {
+public interface IClient extends Closeable {
   /** Send a package. */
   void send(ProtocolPacket packet);
 }

sdk/src/server-api/sc/networking/clients/XStreamClient.java

@@ -249,7 +249,9 @@ protected synchronized void stopReceiver() {
     this.receiveThread.interrupt();
   }
 
-  protected synchronized void close() {
+  /** Closes the client without notifying any listeners.
+   * Prefer {@link #stop()} to end communication properly. */
+  public synchronized void close() {
     if (!isClosed()) {
       this.closed = true;