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/properties/juce_ButtonPropertyComponent.h

@@ -0,0 +1,77 @@
+/*
+  ==============================================================================
+
+   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 PropertyComponent that contains a button.
+
+    This type of property component can be used if you need a button to trigger some
+    kind of action.
+
+    @see PropertyComponent
+
+    @tags{GUI}
+*/
+class JUCE_API  ButtonPropertyComponent  : public PropertyComponent
+{
+public:
+    //==============================================================================
+    /** Creates a button component.
+
+        @param propertyName         the property name to be passed to the PropertyComponent
+        @param triggerOnMouseDown   this is passed to the Button::setTriggeredOnMouseDown() method
+    */
+    ButtonPropertyComponent (const String& propertyName,
+                             bool triggerOnMouseDown);
+
+    /** Destructor. */
+    ~ButtonPropertyComponent();
+
+    //==============================================================================
+    /** Called when the user clicks the button.
+    */
+    virtual void buttonClicked() = 0;
+
+    /** Returns the string that should be displayed in the button.
+
+        If you need to change this string, call refresh() to update the component.
+    */
+    virtual String getButtonText() const = 0;
+
+    //==============================================================================
+    /** @internal */
+    void refresh();
+
+private:
+    TextButton button;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ButtonPropertyComponent)
+};
+
+} // namespace juce