Fixed performance issues and local image gen

Fixed some memory leaks which were slowing down the game after pressing Undo many times
Fixed issue with local image gen sometimes not working at all
Added save cleaning logic: When pressing save and exit, unused images and sounds will be deleted
Fixed error when using non-instruct-style story with instruct-style event checks when failing a quest task
Fixed crafting exploit by disabling crafting tabs while AI is crafting
Improved scrolling speed consistency