Replace RMS voice detection with TeamSpeak's own RNN VAD

Ports WebRTC's rnn_vad (as TS3 embeds it) to Java: LPC, pitch
estimation, spectral features and the RNN itself, feeding a
speech-probability detector that replaces the old SpeechDetector.
Also switches the volume-gate threshold from raw dBFS to
InputLevel's scale, matching TS3's own slider and range, with a
migration for settings saved under the old key.

ts3-client/swing/pom.xml

@@ -35,6 +35,12 @@
             <groupId>com.github.weisj</groupId>
             <artifactId>jsvg</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>5.13.4</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>