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_gui_basics/misc/juce_JUCESplashScreen.h

@@ -0,0 +1,78 @@
+/*
+  ==============================================================================
+
+   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.
+
+  ==============================================================================
+*/
+
+/*
+  ==============================================================================
+
+   In accordance with the terms of the JUCE 5 End-Use License Agreement, the
+   JUCE Code in SECTION A cannot be removed, changed or otherwise rendered
+   ineffective unless you have a JUCE Indie or Pro license, or are using JUCE
+   under the GPL v3 license.
+
+   End User License Agreement: www.juce.com/juce-5-licence
+
+  ==============================================================================
+*/
+
+// BEGIN SECTION A
+
+namespace juce
+{
+
+/**
+    The standard JUCE splash screen component.
+
+    @tags{GUI}
+*/
+class JUCE_API  JUCESplashScreen  : public Component,
+                                    private Timer,
+                                    private DeletedAtShutdown
+{
+public:
+    JUCESplashScreen (Component& parentToAddTo);
+    ~JUCESplashScreen();
+
+    static std::unique_ptr<Drawable> getSplashScreenLogo();
+
+private:
+    void paint (Graphics&) override;
+    void timerCallback() override;
+    void parentSizeChanged() override;
+    void parentHierarchyChanged() override;
+    bool hitTest (int, int) override;
+    void mouseUp (const MouseEvent&) override;
+
+    std::unique_ptr<Drawable> content;
+    CriticalSection appUsageReporting;
+    ComponentAnimator fader;
+    bool hasStartedFading = false;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (JUCESplashScreen)
+};
+
+// END SECTION A
+
+} // namespace juce