1. New feature: Swap the position of the foreground window with a background window by Alt + Click the background window.
   • This feature is useful after updating multi-window apps like google chrome, when window positions are incorrectly swapped due to failure of PW to match new window with killed one.
   • The foreground and background window must share the same process name.
   • This feature can be turned off by command option -swap_window_pos_when_alt_activate=0
2. #435, add uninstall.bat script to remove auto-start task and high-dpi registry (created by auto start script) and private application data directory (created by PW). User still need to manually delete the unzipped PW dir.
3. Fix crash and exceptions.