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_opengl/geometry/juce_Vector3D.h

@@ -0,0 +1,84 @@
+/*
+  ==============================================================================
+
+   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 three-coordinate vector.
+
+    @tags{OpenGL}
+*/
+template <typename Type>
+class Vector3D
+{
+public:
+    Vector3D() noexcept                                        : x(), y(), z() {}
+    Vector3D (Type xValue, Type yValue, Type zValue) noexcept  : x (xValue), y (yValue), z (zValue) {}
+    Vector3D (const Vector3D& other) noexcept                  : x (other.x), y (other.y), z (other.z) {}
+    Vector3D& operator= (Vector3D other) noexcept              { x = other.x;  y = other.y;  z = other.z; return *this; }
+
+    /** Returns a vector that lies along the X axis. */
+    static Vector3D xAxis() noexcept                        { return { (Type) 1, 0, 0 }; }
+    /** Returns a vector that lies along the Y axis. */
+    static Vector3D yAxis() noexcept                        { return { 0, (Type) 1, 0 }; }
+    /** Returns a vector that lies along the Z axis. */
+    static Vector3D zAxis() noexcept                        { return { 0, 0, (Type) 1 }; }
+
+    Vector3D& operator+= (Vector3D other) noexcept          { x += other.x;  y += other.y;  z += other.z;  return *this; }
+    Vector3D& operator-= (Vector3D other) noexcept          { x -= other.x;  y -= other.y;  z -= other.z;  return *this; }
+    Vector3D& operator*= (Type scaleFactor) noexcept        { x *= scaleFactor;  y *= scaleFactor;  z *= scaleFactor;  return *this; }
+    Vector3D& operator/= (Type scaleFactor) noexcept        { x /= scaleFactor;  y /= scaleFactor;  z /= scaleFactor;  return *this; }
+
+    Vector3D operator+ (Vector3D other) const noexcept      { return { x + other.x, y + other.y, z + other.z }; }
+    Vector3D operator- (Vector3D other) const noexcept      { return { x - other.x, y - other.y, z - other.z }; }
+    Vector3D operator* (Type scaleFactor) const noexcept    { return { x * scaleFactor, y * scaleFactor, z * scaleFactor }; }
+    Vector3D operator/ (Type scaleFactor) const noexcept    { return { x / scaleFactor, y / scaleFactor, z / scaleFactor }; }
+    Vector3D operator-() const noexcept                     { return { -x, -y, -z }; }
+
+    /** Returns the dot-product of these two vectors. */
+    Type operator* (Vector3D other) const noexcept          { return x * other.x + y * other.y + z * other.z; }
+
+    /** Returns the cross-product of these two vectors. */
+    Vector3D operator^ (Vector3D other) const noexcept      { return { y * other.z - z * other.y, z * other.x - x * other.z, x * other.y - y * other.x }; }
+
+    Type length() const noexcept                            { return std::sqrt (lengthSquared()); }
+    Type lengthSquared() const noexcept                     { return x * x + y * y + z * z; }
+
+    Vector3D normalised() const noexcept                    { return *this / length(); }
+
+    /** Returns true if the vector is practically equal to the origin. */
+    bool lengthIsBelowEpsilon() const noexcept
+    {
+        auto epsilon = std::numeric_limits<Type>::epsilon();
+        return ! (x < -epsilon || x > epsilon || y < -epsilon || y > epsilon || z < -epsilon || z > epsilon);
+    }
+
+    Type x, y, z;
+};
+
+} // namespace juce