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_events/timers/juce_MultiTimer.h

@@ -0,0 +1,125 @@
+/*
+  ==============================================================================
+
+   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
+{
+
+//==============================================================================
+/**
+    A type of timer class that can run multiple timers with different frequencies,
+    all of which share a single callback.
+
+    This class is very similar to the Timer class, but allows you run multiple
+    separate timers, where each one has a unique ID number. The methods in this
+    class are exactly equivalent to those in Timer, but with the addition of
+    this ID number.
+
+    To use it, you need to create a subclass of MultiTimer, implementing the
+    timerCallback() method. Then you can start timers with startTimer(), and
+    each time the callback is triggered, it passes in the ID of the timer that
+    caused it.
+
+    @see Timer
+
+    @tags{Events}
+*/
+class JUCE_API  MultiTimer
+{
+protected:
+    //==============================================================================
+    /** Creates a MultiTimer.
+
+        When created, no timers are running, so use startTimer() to start things off.
+    */
+    MultiTimer() noexcept;
+
+    /** Creates a copy of another timer.
+
+        Note that this timer will not contain any running timers, even if the one you're
+        copying from was running.
+    */
+    MultiTimer (const MultiTimer&) noexcept;
+
+public:
+    //==============================================================================
+    /** Destructor. */
+    virtual ~MultiTimer();
+
+    //==============================================================================
+    /** The user-defined callback routine that actually gets called by each of the
+        timers that are running.
+
+        It's perfectly ok to call startTimer() or stopTimer() from within this
+        callback to change the subsequent intervals.
+    */
+    virtual void timerCallback (int timerID) = 0;
+
+    //==============================================================================
+    /** Starts a timer and sets the length of interval required.
+
+        If the timer is already started, this will reset it, so the
+        time between calling this method and the next timer callback
+        will not be less than the interval length passed in.
+
+        @param timerID                  a unique Id number that identifies the timer to
+                                        start. This is the id that will be passed back
+                                        to the timerCallback() method when this timer is
+                                        triggered
+        @param  intervalInMilliseconds  the interval to use (any values less than 1 will be
+                                        rounded up to 1)
+    */
+    void startTimer (int timerID, int intervalInMilliseconds) noexcept;
+
+    /** Stops a timer.
+
+        If a timer has been started with the given ID number, it will be cancelled.
+        No more callbacks will be made for the specified timer after this method returns.
+
+        If this is called from a different thread, any callbacks that may
+        be currently executing may be allowed to finish before the method
+        returns.
+    */
+    void stopTimer (int timerID) noexcept;
+
+    //==============================================================================
+    /** Checks whether a timer has been started for a specified ID.
+        @returns true if a timer with the given ID is running.
+    */
+    bool isTimerRunning (int timerID) const noexcept;
+
+    /** Returns the interval for a specified timer ID.
+        @returns    the timer's interval in milliseconds if it's running, or 0 if no
+                    timer was running for the ID number specified.
+    */
+    int getTimerInterval (int timerID) const noexcept;
+
+
+    //==============================================================================
+private:
+    SpinLock timerListLock;
+    OwnedArray<Timer> timers;
+
+    Timer* getCallback (int) const noexcept;
+    MultiTimer& operator= (const MultiTimer&);
+};
+
+} // namespace juce