return_by_rclick 

Ren'py have two problems about rclick and autosave.

1: When the screen "yesno_prompt" is shown by quickmenu, a user can't close it by rclick but open the game menu over it.
2: Autosave is done in main menu when click the close button. It is because main_menu is set False.

I set config.quit_action to Quit() if ren'py has screen "yesno_prompt" and allowed ren'py to close screen "yesno_prompt" by rclick if it was being shown by Quit() to fix these problem.

But this has issue, if a user use label "comfirm_quit", it isn't executed.