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/geometry/juce_PathIterator.h

@@ -0,0 +1,112 @@
+/*
+  ==============================================================================
+
+   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
+{
+
+//==============================================================================
+/**
+    Flattens a Path object into a series of straight-line sections.
+
+    Use one of these to iterate through a Path object, and it will convert
+    all the curves into line sections so it's easy to render or perform
+    geometric operations on.
+
+    @see Path
+
+    @tags{Graphics}
+*/
+class JUCE_API  PathFlatteningIterator  final
+{
+public:
+    //==============================================================================
+    /** Creates a PathFlatteningIterator.
+
+        After creation, use the next() method to initialise the fields in the
+        object with the first line's position.
+
+        @param path         the path to iterate along
+        @param transform    a transform to apply to each point in the path being iterated
+        @param tolerance    the amount by which the curves are allowed to deviate from the lines
+                            into which they are being broken down - a higher tolerance contains
+                            less lines, so can be generated faster, but will be less smooth.
+    */
+    PathFlatteningIterator (const Path& path,
+                            const AffineTransform& transform = AffineTransform(),
+                            float tolerance = Path::defaultToleranceForMeasurement);
+
+    /** Destructor. */
+    ~PathFlatteningIterator();
+
+    //==============================================================================
+    /** Fetches the next line segment from the path.
+
+        This will update the member variables x1, y1, x2, y2, subPathIndex and closesSubPath
+        so that they describe the new line segment.
+
+        @returns false when there are no more lines to fetch.
+    */
+    bool next();
+
+    float x1;  /**< The x position of the start of the current line segment. */
+    float y1;  /**< The y position of the start of the current line segment. */
+    float x2;  /**< The x position of the end of the current line segment. */
+    float y2;  /**< The y position of the end of the current line segment. */
+
+    /** Indicates whether the current line segment is closing a sub-path.
+
+        If the current line is the one that connects the end of a sub-path
+        back to the start again, this will be true.
+    */
+    bool closesSubPath;
+
+    /** The index of the current line within the current sub-path.
+
+        E.g. you can use this to see whether the line is the first one in the
+        subpath by seeing if it's 0.
+    */
+    int subPathIndex;
+
+    /** Returns true if the current segment is the last in the current sub-path. */
+    bool isLastInSubpath() const noexcept;
+
+private:
+    //==============================================================================
+    const Path& path;
+    const AffineTransform transform;
+    const float* source;
+    const float toleranceSquared;
+    float subPathCloseX = 0, subPathCloseY = 0;
+    const bool isIdentityTransform;
+
+    HeapBlock<float> stackBase { 32 };
+    float* stackPos;
+    size_t stackSize = 32;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (PathFlatteningIterator)
+};
+
+} // namespace juce