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_extra/misc/juce_SystemTrayIconComponent.h

@@ -0,0 +1,107 @@
+/*
+  ==============================================================================
+
+   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
+{
+
+#if JUCE_WINDOWS || JUCE_LINUX || JUCE_MAC || DOXYGEN
+
+
+//==============================================================================
+/**
+    This component sits in the taskbar tray as a small icon.
+
+    (NB: The exact behaviour of this class will differ between OSes, and it
+    isn't fully implemented for all OSes)
+
+    To use it, just create one of these components, but don't attempt to make it
+    visible, add it to a parent, or put it on the desktop.
+
+    You can then call setIconImage() to create an icon for it in the taskbar.
+
+    To change the icon's tooltip, you can use setIconTooltip().
+
+    To respond to mouse-events, you can override the normal mouseDown(),
+    mouseUp(), mouseDoubleClick() and mouseMove() methods, and although the x, y
+    position will not be valid, you can use this to respond to clicks. Traditionally
+    you'd use a left-click to show your application's window, and a right-click
+    to show a pop-up menu.
+
+    @tags{GUI}
+*/
+class JUCE_API  SystemTrayIconComponent  : public Component
+{
+public:
+    //==============================================================================
+    SystemTrayIconComponent();
+
+    /** Destructor. */
+    ~SystemTrayIconComponent();
+
+    //==============================================================================
+    /** Changes the image shown in the taskbar. */
+    void setIconImage (const Image& newImage);
+
+    /** Changes the icon's tooltip (if the current OS supports this). */
+    void setIconTooltip (const String& tooltip);
+
+    /** Highlights the icon (if the current OS supports this). */
+    void setHighlighted (bool);
+
+    /** Shows a floating text bubble pointing to the icon (if the current OS supports this). */
+    void showInfoBubble (const String& title, const String& content);
+
+    /** Hides the icon's floating text bubble (if the current OS supports this). */
+    void hideInfoBubble();
+
+    /** Returns the raw handle to whatever kind of internal OS structure is
+        involved in showing this icon.
+        @see ComponentPeer::getNativeHandle()
+    */
+    void* getNativeHandle() const;
+
+   #if JUCE_LINUX
+    /** @internal */
+    void paint (Graphics&) override;
+   #endif
+
+   #if JUCE_MAC
+    /** Shows a menu attached to the OSX menu bar icon. */
+    void showDropdownMenu (const PopupMenu& menu);
+   #endif
+
+private:
+    //==============================================================================
+    JUCE_PUBLIC_IN_DLL_BUILD (class Pimpl)
+    std::unique_ptr<Pimpl> pimpl;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SystemTrayIconComponent)
+};
+
+
+#endif
+
+} // namespace juce