Converted the save file dialog to the Common Item Dialog system and resolved a few TODOs.
Converted the save file dialog to the Common Item Dialog system and resolved a few TODOs.

mantyr/libui,sclukey/libui,tbodt/libui,ProtonMail/libui,sclukey/libui,mantyr/libui,ProtonMail/libui,mantyr/libui,tbodt/libui,ProtonMail/libui