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_dsp/frequency/juce_Windowing.h

@@ -0,0 +1,82 @@
+/*
+  ==============================================================================
+
+   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
+{
+namespace dsp
+{
+
+/**
+    A class which provides multiple windowing functions useful for filter design
+    and spectrum analyzers
+
+    @tags{DSP}
+*/
+template <typename FloatType>
+struct WindowingFunction
+{
+    enum WindowingMethod
+    {
+        rectangular = 0,
+        triangular,
+        hann,
+        hamming,
+        blackman,
+        blackmanHarris,
+        flatTop,
+        kaiser,
+        numWindowingMethods
+    };
+
+    //==============================================================================
+    WindowingFunction (size_t size, WindowingMethod,
+                       bool normalize = true, FloatType beta = 0);
+
+    //==============================================================================
+    /** Fills the content of an array with a given windowing method table */
+    void fillWindowingTables (size_t size, WindowingMethod type,
+                              bool normalize = true, FloatType beta = 0) noexcept;
+
+    /** Fills the content of an array with a given windowing method table */
+    static void fillWindowingTables (FloatType* samples, size_t size, WindowingMethod,
+                                     bool normalize = true, FloatType beta = 0) noexcept;
+
+    /** Multiply the content of a buffer with the given window */
+    void multiplyWithWindowingTable (FloatType* samples, size_t size) noexcept;
+
+    /** Returns the name of a given windowing method */
+    static const char* getWindowingMethodName (WindowingMethod) noexcept;
+
+
+private:
+    //==============================================================================
+    Array<FloatType> windowTable;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (WindowingFunction)
+};
+
+} // namespace dsp
+} // namespace juce