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_GlowEffect.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 component effect that adds a coloured blur around the component's contents.
+
+    (This will only work on non-opaque components).
+
+    @see Component::setComponentEffect, DropShadowEffect
+
+    @tags{Graphics}
+*/
+class JUCE_API  GlowEffect  : public ImageEffectFilter
+{
+public:
+    //==============================================================================
+    /** Creates a default 'glow' effect.
+        To customise its appearance, use the setGlowProperties() method.
+    */
+    GlowEffect();
+
+    /** Destructor. */
+    ~GlowEffect();
+
+    //==============================================================================
+    /** Sets the glow's radius and colour.
+
+        The radius is how large the blur should be, and the colour is
+        used to render it (for a less intense glow, lower the colour's
+        opacity).
+    */
+    void setGlowProperties (float newRadius,
+                            Colour newColour,
+                            Point<int> offset = {});
+
+
+    //==============================================================================
+    /** @internal */
+    void applyEffect (Image&, Graphics&, float scaleFactor, float alpha) override;
+
+private:
+    //==============================================================================
+    float radius = 2.0f;
+    Colour colour { Colours::white };
+    Point<int> offset;
+
+    JUCE_LEAK_DETECTOR (GlowEffect)
+};
+
+} // namespace juce