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_AudioParameterBool.h

@@ -0,0 +1,94 @@
+/*
+  ==============================================================================
+
+   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 as a boolean value.
+
+    @see AudioParameterFloat, AudioParameterInt, AudioParameterChoice
+
+    @tags{Audio}
+*/
+class JUCE_API AudioParameterBool  : public AudioProcessorParameterWithID
+{
+public:
+    /** Creates a AudioParameterBool with the specified parameters.
+
+        @param parameterID         The parameter ID to use
+        @param name                The parameter name to use
+        @param defaultValue        The default value
+        @param label               An optional label for the parameter's value
+        @param stringFromBool      An optional lambda function that converts a bool
+                                   value to a string with a maximum length. This may
+                                   be used by hosts to display the parameter's value.
+        @param boolFromString      An optional lambda function that parses a string and
+                                   converts it into a bool value. Some hosts use this
+                                   to allow users to type in parameter values.
+    */
+    AudioParameterBool (const String& parameterID, const String& name, bool defaultValue,
+                        const String& label = String(),
+                        std::function<String (bool value, int maximumStringLength)> stringFromBool = nullptr,
+                        std::function<bool (const String& text)> boolFromString = nullptr);
+
+    /** Destructor. */
+    ~AudioParameterBool();
+
+    /** Returns the parameter's current boolean value. */
+    bool get() const noexcept          { return value >= 0.5f; }
+    /** Returns the parameter's current boolean value. */
+    operator bool() const noexcept     { return get(); }
+
+    /** Changes the parameter's current value to a new boolean. */
+    AudioParameterBool& operator= (bool newValue);
+
+protected:
+    /** Override this method if you are interested in receiving callbacks
+        when the parameter value changes.
+    */
+    virtual void valueChanged (bool newValue);
+
+private:
+    //==============================================================================
+    float getValue() const override;
+    void setValue (float newValue) override;
+    float getDefaultValue() const override;
+    int getNumSteps() const override;
+    bool isDiscrete() const override;
+    bool isBoolean() const override;
+    String getText (float, int) const override;
+    float getValueForText (const String&) const override;
+
+    float value;
+    const float defaultValue;
+    std::function<String (bool, int)> stringFromBoolFunction;
+    std::function<bool (const String&)> boolFromStringFunction;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioParameterBool)
+};
+
+} // namespace juce