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_gui_basics/layout/juce_GroupComponent.h

@@ -0,0 +1,113 @@
+/*
+  ==============================================================================
+
+   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
+{
+
+//==============================================================================
+/**
+    A component that draws an outline around itself and has an optional title at
+    the top, for drawing an outline around a group of controls.
+
+
+    @tags{GUI}
+*/
+class JUCE_API  GroupComponent    : public Component
+{
+public:
+    //==============================================================================
+    /** Creates a GroupComponent.
+
+        @param componentName    the name to give the component
+        @param labelText        the text to show at the top of the outline
+    */
+    GroupComponent (const String& componentName = String(),
+                    const String& labelText = String());
+
+    /** Destructor. */
+    ~GroupComponent();
+
+    //==============================================================================
+    /** Changes the text that's shown at the top of the component. */
+    void setText (const String& newText);
+
+    /** Returns the currently displayed text label. */
+    String getText() const;
+
+    /** Sets the positioning of the text label.
+
+        (The default is Justification::left)
+
+        @see getTextLabelPosition
+    */
+    void setTextLabelPosition (Justification justification);
+
+    /** Returns the current text label position.
+
+        @see setTextLabelPosition
+    */
+    Justification getTextLabelPosition() const noexcept           { return justification; }
+
+    //==============================================================================
+    /** A set of colour IDs to use to change the colour of various aspects of the component.
+
+        These constants can be used either via the Component::setColour(), or LookAndFeel::setColour()
+        methods.
+
+        @see Component::setColour, Component::findColour, LookAndFeel::setColour, LookAndFeel::findColour
+    */
+    enum ColourIds
+    {
+        outlineColourId     = 0x1005400,    /**< The colour to use for drawing the line around the edge. */
+        textColourId        = 0x1005410     /**< The colour to use to draw the text label. */
+    };
+
+    //==============================================================================
+    /** This abstract base class is implemented by LookAndFeel classes. */
+    struct JUCE_API  LookAndFeelMethods
+    {
+        virtual ~LookAndFeelMethods() {}
+
+        virtual void drawGroupComponentOutline (Graphics&, int w, int h, const String& text,
+                                                const Justification&, GroupComponent&) = 0;
+    };
+
+    //==============================================================================
+    /** @internal */
+    void paint (Graphics&) override;
+    /** @internal */
+    void enablementChanged() override;
+    /** @internal */
+    void colourChanged() override;
+
+private:
+    String text;
+    Justification justification;
+
+    JUCE_DECLARE_NON_COPYABLE (GroupComponent)
+};
+
+} // namespace juce