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_core/text/juce_NewLine.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.
+
+   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
+{
+
+//==============================================================================
+/** This class is used for represent a new-line character sequence.
+
+    To write a new-line to a stream, you can use the predefined 'newLine' variable, e.g.
+    @code
+    myOutputStream << "Hello World" << newLine << newLine;
+    @endcode
+
+    The exact character sequence that will be used for the new-line can be set and
+    retrieved with OutputStream::setNewLineString() and OutputStream::getNewLineString().
+
+    @tags{Core}
+*/
+class JUCE_API  NewLine
+{
+public:
+    /** Returns the default new-line sequence that the library uses.
+        @see OutputStream::setNewLineString()
+    */
+    static const char* getDefault() noexcept        { return "\r\n"; }
+
+    /** Returns the default new-line sequence that the library uses.
+        @see getDefault()
+    */
+    operator String() const                         { return getDefault(); }
+
+    /** Returns the default new-line sequence that the library uses.
+        @see OutputStream::setNewLineString()
+    */
+    operator StringRef() const noexcept             { return getDefault(); }
+};
+
+//==============================================================================
+/** A predefined object representing a new-line, which can be written to a string or stream.
+
+    To write a new-line to a stream, you can use the predefined 'newLine' variable like this:
+    @code
+    myOutputStream << "Hello World" << newLine << newLine;
+    @endcode
+*/
+extern NewLine newLine;
+
+//==============================================================================
+/** Writes a new-line sequence to a string.
+    You can use the predefined object 'newLine' to invoke this, e.g.
+    @code
+    myString << "Hello World" << newLine << newLine;
+    @endcode
+*/
+inline String& operator<< (String& string1, const NewLine&) { return string1 += NewLine::getDefault(); }
+inline String& operator+= (String& s1, const NewLine&)      { return s1 += NewLine::getDefault(); }
+
+inline String operator+ (const NewLine&, const NewLine&)    { return String (NewLine::getDefault()) + NewLine::getDefault(); }
+inline String operator+ (String s1, const NewLine&)         { return s1 += NewLine::getDefault(); }
+inline String operator+ (const NewLine&, const char* s2)    { return String (NewLine::getDefault()) + s2; }
+
+} // namespace juce