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_blocks_basics/blocks/juce_LEDRow.h

@@ -0,0 +1,64 @@
+/*
+  ==============================================================================
+
+   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.
+
+   The code included in this file is provided under the terms of the ISC license
+   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
+   To use, copy, modify, and/or distribute this software for any purpose with or
+   without fee is hereby granted provided that the above copyright notice and
+   this permission notice appear in all copies.
+
+   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
+{
+
+/**
+    Represents an LED strip on a device.
+
+    @tags{Blocks}
+*/
+class LEDRow
+{
+public:
+    LEDRow (Block&);
+
+    /** Destructor. */
+    virtual ~LEDRow();
+
+    //==============================================================================
+    /** Return the number of LEDs in the row. */
+    virtual int getNumLEDs() const = 0;
+
+    /** Sets the colour of the corresponding LED. */
+    virtual void setLEDColour (int index, LEDColour newColour) = 0;
+
+    /** Overlays all LEDs with a single colour.
+
+        Whilst the overlay is set subsequent calls to setLEDColour will happen
+        *behind* the overlay, and will be invisible to the user until the
+        overlay is removed.
+    */
+    virtual void setOverlayColour (LEDColour newColour) = 0;
+
+    /* Removes an overlay colour. */
+    virtual void resetOverlayColour() = 0;
+
+    /** The device that these lights belong to. */
+    Block& block;
+
+private:
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (LEDRow)
+};
+
+} // namespace juce