Merge SOC2009_FSWATCHER branch into trunk.

Merges everything from the branch with only some minor changes, mostly renamed
wxUSE_FSWATCHER_{INOTIFY,KQUEUE} to wxHAS_{INOTIFY,KQUEUE}.

Add wxFileSystemWatcher and related classes.

Also introduces wxEventLoopSource.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62474 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/unix/fswatcher_kqueue.h

@@ -0,0 +1,35 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/unix/fswatcher_kqueue.h
+// Purpose:     wxKqueueFileSystemWatcher
+// Author:      Bartosz Bekier
+// Created:     2009-05-26
+// RCS-ID:      $Id$
+// Copyright:   (c) 2009 Bartosz Bekier <bartosz.bekier@gmail.com>
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_FSWATCHER_KQUEUE_H_
+#define _WX_FSWATCHER_KQUEUE_H_
+
+#include "wx/defs.h"
+
+#if wxUSE_FSWATCHER
+
+class WXDLLIMPEXP_BASE wxKqueueFileSystemWatcher :
+        public wxFileSystemWatcherBase
+{
+public:
+    wxKqueueFileSystemWatcher();
+
+    wxKqueueFileSystemWatcher(const wxFileName& path,
+                              int events = wxFSW_EVENT_ALL);
+
+    virtual ~wxKqueueFileSystemWatcher();
+
+protected:
+    bool Init();
+};
+
+#endif
+
+#endif /* _WX_FSWATCHER_OSX_H_ */