Update ts3j: resend like the official client; clean up failed connects

- ts3j: native resend timing, INIT1 resends, one clientinitiv per handshake,
  non-blocking disconnect.
- Ignore errors from a connect attempt that has been superseded or cancelled.
- Show the whole cause chain in network error messages.
- -Dts3j.debug=true enables ts3j's protocol logging.
- Tests run with a throwaway user.home instead of the real profile.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ts3-client/pom.xml

@@ -34,6 +34,12 @@
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-surefire-plugin</artifactId>
                     <version>${surefire.version}</version>
+                    <configuration>
+                        <!-- The stores resolve ~/.ts3jclient once per JVM; keep every test out of the real profile. -->
+                        <systemPropertyVariables>
+                            <user.home>${project.build.directory}/test-home</user.home>
+                        </systemPropertyVariables>
+                    </configuration>
                 </plugin>
             </plugins>
         </pluginManagement>