Remove warnings for unreferenced parameters

The warnings in dummy functions are preventing the project from being
compiled with warnings as errors.

There were two options:

* Using a define to create a noop (chosen option).

* Commenting out the variable name, leaving only the type.

The first option was chosen because the second option would leave out
information from the IDE and compiler, while the first option wouldn't.

The intent is also clearer with the first option, otherwise it would
likely be necessary to leave comments with every single parameter that
was commented out.

src/tabcontrollers/audiomanager/AudioManagerDummy.cpp

@@ -1,16 +1,22 @@
 #include "AudioManagerDummy.h"
 
+// Used to get the compiler to shut up about C4100: unreferenced formal parameter.
+#define UNREFERENCED_PARAMETER(P) (P)
+
 // application namespace
 namespace advsettings {
 
 void AudioManagerDummy::init(AudioTabController *controller)
 {
     // noop
+    UNREFERENCED_PARAMETER(controller);
 }
 
 void AudioManagerDummy::setPlaybackDevice(const std::string &id, bool notify)
 {
     // noop
+    UNREFERENCED_PARAMETER(id);
+    UNREFERENCED_PARAMETER(notify);
 }
 
 std::string AudioManagerDummy::getPlaybackDevName()
@@ -26,6 +32,8 @@ std::string AudioManagerDummy::getPlaybackDevId()
 void AudioManagerDummy::setMirrorDevice(const std::string &id, bool notify)
 {
     // noop
+    UNREFERENCED_PARAMETER(id);
+    UNREFERENCED_PARAMETER(notify);
 }
 
 bool AudioManagerDummy::isMirrorValid()
@@ -50,6 +58,7 @@ float AudioManagerDummy::getMirrorVolume()
 
 bool AudioManagerDummy::setMirrorVolume(float value)
 {
+    UNREFERENCED_PARAMETER(value);
     return false;
 }
 
@@ -60,6 +69,7 @@ bool AudioManagerDummy::getMirrorMuted()
 
 bool AudioManagerDummy::setMirrorMuted(bool value)
 {
+    UNREFERENCED_PARAMETER(value);
     return false;
 }
 
@@ -71,6 +81,8 @@ bool AudioManagerDummy::isMicValid()
 void AudioManagerDummy::setMicDevice(const std::string &id, bool notify)
 {
     // noop
+    UNREFERENCED_PARAMETER(id);
+    UNREFERENCED_PARAMETER(notify);
 }
 
 std::string AudioManagerDummy::getMicDevName()
@@ -90,6 +102,7 @@ float AudioManagerDummy::getMicVolume()
 
 bool AudioManagerDummy::setMicVolume(float value)
 {
+    UNREFERENCED_PARAMETER(value);
     return false;
 }
 
@@ -100,6 +113,7 @@ bool AudioManagerDummy::getMicMuted()
 
 bool AudioManagerDummy::setMicMuted(bool value)
 {
+    UNREFERENCED_PARAMETER(value);
     return false;
 }