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/native/java/AndroidRuntimePermissions.java

@@ -0,0 +1,12 @@
+    @Override
+    public void onRequestPermissionsResult (int permissionID, String permissions[], int[] grantResults)
+    {
+        boolean permissionsGranted = (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED);
+
+        if (! permissionsGranted)
+            Log.d ("JUCE", "onRequestPermissionsResult: runtime permission was DENIED: " + getAndroidPermissionName (permissionID));
+
+        Long ptrToCallback = permissionCallbackPtrMap.get (permissionID);
+        permissionCallbackPtrMap.remove (permissionID);
+        androidRuntimePermissionsCallback (permissionsGranted, ptrToCallback);
+    }