feat(velocity): disable netty injection when packetevents is in use

triton-velocity/src/main/java/com/rexcantor64/triton/velocity/player/VelocityLanguagePlayer.java

@@ -140,6 +140,12 @@ public void refreshAll() {
     }
 
     public void injectNettyPipeline() {
+        if (Triton.get().getConfig().isUsePacketEvents()) {
+            // PacketEvents handler covers all packets translated by Velocity,
+            // so no need to inject ourselves into netty anymore.
+            Triton.get().getLogger().logDebug("Skipped injecting into netty pipeline for player %1 because PacketEvents is in use", getUUID());
+            return;
+        }
         ConnectedPlayer connectedPlayer = (ConnectedPlayer) this.parent;
         connectedPlayer.getConnection().getChannel().pipeline()
                 .addAfter(Connections.MINECRAFT_ENCODER, "triton-custom-encoder", new VelocityNettyEncoder(this));