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/xml/juce_XmlDocument.h

@@ -0,0 +1,175 @@
+/*
+  ==============================================================================
+
+   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
+{
+
+//==============================================================================
+/**
+    Parses a text-based XML document and creates an XmlElement object from it.
+
+    The parser will parse DTDs to load external entities but won't
+    check the document for validity against the DTD.
+
+    e.g.
+    @code
+
+    XmlDocument myDocument (File ("myfile.xml"));
+    std::unique_ptr<XmlElement> mainElement (myDocument.getDocumentElement());
+
+    if (mainElement == nullptr)
+    {
+        String error = myDocument.getLastParseError();
+    }
+    else
+    {
+        ..use the element
+    }
+
+    @endcode
+
+    Or you can use the static helper methods for quick parsing..
+
+    @code
+    std::unique_ptr<XmlElement> xml (XmlDocument::parse (myXmlFile));
+
+    if (xml != nullptr && xml->hasTagName ("foobar"))
+    {
+        ...etc
+    }
+    @endcode
+
+    @see XmlElement
+
+    @tags{Core}
+*/
+class JUCE_API  XmlDocument
+{
+public:
+    //==============================================================================
+    /** Creates an XmlDocument from the xml text.
+        The text doesn't actually get parsed until the getDocumentElement() method is called.
+    */
+    XmlDocument (const String& documentText);
+
+    /** Creates an XmlDocument from a file.
+        The text doesn't actually get parsed until the getDocumentElement() method is called.
+    */
+    XmlDocument (const File& file);
+
+    /** Destructor. */
+    ~XmlDocument();
+
+    //==============================================================================
+    /** Creates an XmlElement object to represent the main document node.
+
+        This method will do the actual parsing of the text, and if there's a
+        parse error, it may returns nullptr (and you can find out the error using
+        the getLastParseError() method).
+
+        See also the parse() methods, which provide a shorthand way to quickly
+        parse a file or string.
+
+        @param onlyReadOuterDocumentElement     if true, the parser will only read the
+                                                first section of the file, and will only
+                                                return the outer document element - this
+                                                allows quick checking of large files to
+                                                see if they contain the correct type of
+                                                tag, without having to parse the entire file
+        @returns    a new XmlElement which the caller will need to delete, or null if
+                    there was an error.
+        @see getLastParseError
+    */
+    XmlElement* getDocumentElement (bool onlyReadOuterDocumentElement = false);
+
+    /** Returns the parsing error that occurred the last time getDocumentElement was called.
+
+        @returns the error, or an empty string if there was no error.
+    */
+    const String& getLastParseError() const noexcept;
+
+    /** Sets an input source object to use for parsing documents that reference external entities.
+
+        If the document has been created from a file, this probably won't be needed, but
+        if you're parsing some text and there might be a DTD that references external
+        files, you may need to create a custom input source that can retrieve the
+        other files it needs.
+
+        The object that is passed-in will be deleted automatically when no longer needed.
+
+        @see InputSource
+    */
+    void setInputSource (InputSource* newSource) noexcept;
+
+    /** Sets a flag to change the treatment of empty text elements.
+
+        If this is true (the default state), then any text elements that contain only
+        whitespace characters will be ingored during parsing. If you need to catch
+        whitespace-only text, then you should set this to false before calling the
+        getDocumentElement() method.
+    */
+    void setEmptyTextElementsIgnored (bool shouldBeIgnored) noexcept;
+
+    //==============================================================================
+    /** A handy static method that parses a file.
+        This is a shortcut for creating an XmlDocument object and calling getDocumentElement() on it.
+        @returns    a new XmlElement which the caller will need to delete, or null if there was an error.
+    */
+    static XmlElement* parse (const File& file);
+
+    /** A handy static method that parses some XML data.
+        This is a shortcut for creating an XmlDocument object and calling getDocumentElement() on it.
+        @returns    a new XmlElement which the caller will need to delete, or null if there was an error.
+    */
+    static XmlElement* parse (const String& xmlData);
+
+
+    //==============================================================================
+private:
+    String originalText;
+    String::CharPointerType input { nullptr };
+    bool outOfData = false, errorOccurred = false;
+    String lastError, dtdText;
+    StringArray tokenisedDTD;
+    bool needToLoadDTD = false, ignoreEmptyTextElements = true;
+    std::unique_ptr<InputSource> inputSource;
+
+    XmlElement* parseDocumentElement (String::CharPointerType, bool outer);
+    void setLastError (const String&, bool carryOn);
+    bool parseHeader();
+    bool parseDTD();
+    void skipNextWhiteSpace();
+    juce_wchar readNextChar() noexcept;
+    XmlElement* readNextElement (bool alsoParseSubElements);
+    void readChildElements (XmlElement&);
+    void readQuotedString (String&);
+    void readEntity (String&);
+
+    String getFileContents (const String&) const;
+    String expandEntity (const String&);
+    String expandExternalEntity (const String&);
+    String getParameterEntity (const String&);
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (XmlDocument)
+};
+
+} // namespace juce