Update notes for 1.0.20

Some resource management optimization for better performance,

Fixed an issue with loading save files that could cause a "failed to load – try again" error,

Fixed an issue where tooltips would sometimes fail to load or appear,

Video backgrounds can now be controlled—pause, adjust volume, restart, and more,

Fixed an issue where resized WEBM props with unlinked width and height would reset upon scene reload, causing them to appear incorrectly,

Fixed a bug where deleted background files caused a black screen when reloading the save file