fix macOS build (following Projucer changes made in Windows, which removed /Applications/JUCE/modules from its headers). move JUCE headers under source control, so that Windows and macOS can both build against same version of JUCE. remove AUv3 target (I think it's an iOS thing, so it will never work with this macOS fluidsynth dylib).

modules/juce_audio_processors/utilities/juce_AudioParameterChoice.h

@@ -0,0 +1,110 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2017 - ROLI Ltd.
+
+   JUCE is an open source library subject to commercial or open-source
+   licensing.
+
+   By using JUCE, you agree to the terms of both the JUCE 5 End-User License
+   Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
+   27th April 2017).
+
+   End User License Agreement: www.juce.com/juce-5-licence
+   Privacy Policy: www.juce.com/juce-5-privacy-policy
+
+   Or: You may also use this code under the terms of the GPL v3 (see
+   www.gnu.org/licenses).
+
+   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
+   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
+   DISCLAIMED.
+
+  ==============================================================================
+*/
+
+namespace juce
+{
+
+/**
+    Provides a class of AudioProcessorParameter that can be used to select
+    an indexed, named choice from a list.
+
+    @see AudioParameterFloat, AudioParameterInt, AudioParameterBool
+
+    @tags{Audio}
+*/
+class JUCE_API  AudioParameterChoice  : public AudioProcessorParameterWithID
+{
+public:
+    /** Creates a AudioParameterChoice with the specified parameters.
+
+        @param parameterID         The parameter ID to use
+        @param name                The parameter name to use
+        @param choices             The set of choices to use
+        @param defaultItemIndex    The index of the default choice
+        @param label               An optional label for the parameter's value
+        @param stringFromIndex     An optional lambda function that converts a choice
+                                   index to a string with a maximum length. This may
+                                   be used by hosts to display the parameter's value.
+        @param indexFromString     An optional lambda function that parses a string and
+                                   converts it into a choice index. Some hosts use this
+                                   to allow users to type in parameter values.
+    */
+    AudioParameterChoice (const String& parameterID, const String& name,
+                          const StringArray& choices,
+                          int defaultItemIndex,
+                          const String& label = String(),
+                          std::function<String (int index, int maximumStringLength)> stringFromIndex = nullptr,
+                          std::function<int (const String& text)> indexFromString = nullptr);
+
+    /** Destructor. */
+    ~AudioParameterChoice();
+
+    /** Returns the current index of the selected item. */
+    int getIndex() const noexcept                   { return roundToInt (value); }
+    /** Returns the current index of the selected item. */
+    operator int() const noexcept                   { return getIndex(); }
+
+    /** Returns the name of the currently selected item. */
+    String getCurrentChoiceName() const noexcept    { return choices[getIndex()]; }
+    /** Returns the name of the currently selected item. */
+    operator String() const noexcept                { return getCurrentChoiceName(); }
+
+    /** Changes the selected item to a new index. */
+    AudioParameterChoice& operator= (int newValue);
+
+    /** Provides access to the list of choices that this parameter is working with. */
+    const StringArray choices;
+
+protected:
+    /** Override this method if you are interested in receiving callbacks
+        when the parameter value changes.
+    */
+    virtual void valueChanged (int newValue);
+
+private:
+    //==============================================================================
+    float getValue() const override;
+    void setValue (float newValue) override;
+    float getDefaultValue() const override;
+    int getNumSteps() const override;
+    bool isDiscrete() const override;
+    String getText (float, int) const override;
+    float getValueForText (const String&) const override;
+
+    int limitRange (int) const noexcept;
+    float convertTo0to1 (int) const noexcept;
+    int convertFrom0to1 (float) const noexcept;
+
+    float value;
+    const int maxIndex;
+    const float defaultValue;
+    std::function<String (int, int)> stringFromIndexFunction;
+    std::function<int (const String&)> indexFromStringFunction;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioParameterChoice)
+};
+
+} // namespace juce