Fixed mute handling and audio LED

* AFV client has own "changedMute" signal
* unmute if started/stopped AFC client
* in statusbar also check audio start/stop to refresh LEDs
* see https://discordapp.com/channels/539048679160676382/539486309882789888/713491666971000872

src/blackcore/afv/clients/afvclient.cpp

@@ -273,7 +273,10 @@ namespace BlackCore
 
             void CAfvClient::setMuted(bool mute)
             {
+                if (this->isMuted() == mute) { return; }
                 this->setNormalizedOutputVolume(mute ? 0 : 50);
+
+                emit this->changedMute(mute);
             }
 
             void CAfvClient::startAudio()
@@ -352,6 +355,13 @@ namespace BlackCore
                 this->onTimerUpdate(); // update values
 
                 emit this->startedAudio(useInputDevice, useOutputDevice);
+
+                if (this->isMuted())
+                {
+                    // un-mute after startup
+                    this->setMuted(false);
+                }
+
             }
 
             void CAfvClient::startAudio(const QString &inputDeviceName, const QString &outputDeviceName)
@@ -388,6 +398,8 @@ namespace BlackCore
                 }
                 CLogMessage(this).info(u"AFV Client stopped");
 
+                if (this->isMuted()) { this->setMuted(false); }
+
                 emit this->inputVolumePeakVU(0.0);
                 emit this->outputVolumePeakVU(0.0);
                 emit this->stoppedAudio();

src/blackcore/afv/clients/afvclient.h

@@ -313,6 +313,9 @@ namespace BlackCore
                 //! Audio has been stopped
                 void stoppedAudio();
 
+                //! Mute changed
+                void changedMute(bool muted);
+
             protected:
                 //! \copydoc BlackMisc::CContinuousWorker::initialize
                 virtual void initialize() override;