Docs: Replace doxygen preprocessor conditionals with @cond and @endconds

modules/juce_audio_processors/processors/juce_AudioPluginInstance.h

@@ -118,7 +118,7 @@ public:
     */
     HostedParameter* getHostedParameter (int index) const;
 
-   #ifndef DOXYGEN
+    /** @cond */
     /** Use the new typesafe visitor-based interface rather than this function.
 
         Returns a pointer to some kind of platform-specific data about the plugin.
@@ -150,7 +150,7 @@ public:
     [[deprecated]] bool isParameterOrientationInverted (int parameterIndex) const override;
     [[deprecated]] bool isMetaParameter (int parameterIndex) const override;
     [[deprecated]] AudioProcessorParameter::Category getParameterCategory (int parameterIndex) const override;
-   #endif
+    /** @endcond */
 
 protected:
     //==============================================================================

modules/juce_audio_processors/processors/juce_AudioProcessor.h

@@ -1487,7 +1487,7 @@ protected:
     void sendParamChangeMessageToListeners (int parameterIndex, float newValue);
 
 public:
-   #ifndef DOXYGEN
+    /** @cond */
     // These methods are all deprecated in favour of using AudioProcessorParameter
     // and AudioProcessorParameterGroup
     [[deprecated]] virtual int getNumParameters();
@@ -1520,7 +1520,7 @@ public:
     [[deprecated]] virtual const String getOutputChannelName (int channelIndex) const;
     [[deprecated]] virtual bool isInputChannelStereoPair  (int index) const;
     [[deprecated]] virtual bool isOutputChannelStereoPair (int index) const;
-   #endif
+    /** @endcond */
 
 private:
     //==============================================================================

modules/juce_audio_processors/processors/juce_AudioProcessorParameterGroup.h

@@ -235,13 +235,13 @@ public:
         addChild (std::forward<Args> (remainingChildren)...);
     }
 
-   #ifndef DOXYGEN
+    /** @cond */
     [[deprecated ("This class now has a move operator, so if you're trying to move them around, you "
                  "should use that, or if you really need to swap two groups, just call std::swap. "
                  "However, remember that swapping a group that's already owned by an AudioProcessor "
                  "will most likely crash the host, so don't do that.")]]
     void swapWith (AudioProcessorParameterGroup& other)  { std::swap (*this, other); }
-   #endif
+    /** @endcond */
 
 private:
     //==============================================================================

modules/juce_audio_processors/processors/juce_GenericAudioProcessorEditor.h

@@ -58,10 +58,10 @@ public:
     void paint (Graphics&) override;
     void resized() override;
 
-   #ifndef DOXYGEN
+    /** @cond */
     [[deprecated ("This constructor has been changed to take a reference instead of a pointer.")]]
     GenericAudioProcessorEditor (AudioProcessor* p)  : GenericAudioProcessorEditor (*p) {}
-   #endif
+    /** @endcond */
 
 private:
     //==============================================================================