Log Message:
Update to 4.6.3.  Changes:
- Avoid causing xfce4-session to time out on startup.
- Fix type in xfconf property name.
- Fix mnemonic widgets in accessibility dialog.
- Fix translation macros in settings helper.
- Always restore the default display scheme on startup.
- Make sure --verbose is simmilar to --debug instead of --version
- Fix compile-issue with libxklavier >= 4