2021 / 2 / 28 optimization update

Sleep function is added to the main window. When running the game, the main window will sleep, saving a lot of CPU power.

Note that you must close the open game window before the main window can resume operation.

During the operation of the game window, it is normal that the main window does not respond. There is no need to worry. At this time, the CPU consumption of the main window is 0.

This update test is OK, but if there are any serious bugs, please contact the author in time!