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_graphics/effects/juce_DropShadowEffect.h

@@ -0,0 +1,114 @@
+/*
+  ==============================================================================
+
+   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
+{
+
+//==============================================================================
+/**
+    Defines a drop-shadow effect.
+
+    @tags{Graphics}
+*/
+struct JUCE_API  DropShadow
+{
+    /** Creates a default drop-shadow effect. */
+    DropShadow() noexcept;
+
+    /** Creates a drop-shadow object with the given parameters. */
+    DropShadow (Colour shadowColour, int radius, Point<int> offset) noexcept;
+
+    /** Renders a drop-shadow based on the alpha-channel of the given image. */
+    void drawForImage (Graphics& g, const Image& srcImage) const;
+
+    /** Renders a drop-shadow based on the shape of a path. */
+    void drawForPath (Graphics& g, const Path& path) const;
+
+    /** Renders a drop-shadow for a rectangle.
+        Note that for speed, this approximates the shadow using gradients.
+    */
+    void drawForRectangle (Graphics& g, const Rectangle<int>& area) const;
+
+    /** The colour with which to render the shadow.
+        In most cases you'll probably want to leave this as black with an alpha
+        value of around 0.5
+    */
+    Colour colour;
+
+    /** The approximate spread of the shadow. */
+    int radius;
+
+    /** The offset of the shadow. */
+    Point<int> offset;
+};
+
+//==============================================================================
+/**
+    An effect filter that adds a drop-shadow behind the image's content.
+
+    (This will only work on images/components that aren't opaque, of course).
+
+    When added to a component, this effect will draw a soft-edged
+    shadow based on what gets drawn inside it. The shadow will also
+    be applied to the component's children.
+
+    For speed, this doesn't use a proper gaussian blur, but cheats by
+    using a simple bilinear filter. If you need a really high-quality
+    shadow, check out ImageConvolutionKernel::createGaussianBlur()
+
+    @see Component::setComponentEffect
+
+    @tags{Graphics}
+*/
+class JUCE_API  DropShadowEffect  : public ImageEffectFilter
+{
+public:
+    //==============================================================================
+    /** Creates a default drop-shadow effect.
+        To customise the shadow's appearance, use the setShadowProperties() method.
+    */
+    DropShadowEffect();
+
+    /** Destructor. */
+    ~DropShadowEffect();
+
+    //==============================================================================
+    /** Sets up parameters affecting the shadow's appearance. */
+    void setShadowProperties (const DropShadow& newShadow);
+
+    //==============================================================================
+    /** @internal */
+    void applyEffect (Image& sourceImage, Graphics& destContext, float scaleFactor, float alpha) override;
+
+
+private:
+    //==============================================================================
+    DropShadow shadow;
+
+    JUCE_LEAK_DETECTOR (DropShadowEffect)
+};
+
+} // namespace juce