1. Feature enhancement: auto save window position history as xml file, so that all auto-restore points and snapshots will persist through PC shutdown/reboot or PW upgrade/restart.
2. #346, fix failure to start for first time PW user when 3rd party taskbar customization software is deployed.
3. #347, when webpage commander is activated for the first time, notify user by redirecting browser to PW help webpage or popping out a balloon tip notification. Remember the disabled status of webpage commander feature when restarting PW.
4. fix undesirable taskbar restore after full-screen game play.
5. fix some crash/exception.