1. New feature: auto save window position history as xml file at PW exit, the history file is automatically reloaded when relaunching PW (without rebooting PC) or upgrade to new PW version, so that previously captured snapshots will continue to function smoothly.
2. Bug fixes for 5.56 introduced new feature: auto inherit killed window pos.
3. #336 : let PW menu reflect -check_upgrade=0
4. #333 : replace obsolete command option -delay_start with -delay_restart to restart PW with specified delay while hiding the DOS launching window, solving issue of failed normal PW start.