Added 'Quit' option under 'File' (#746)
Added 'Quit' option under 'File' (#746)

* Added 'Quit' option under 'File' (#741)

* Edited accelerator

* Hid 'Quit' option on MacOS

* Clarified MacOS menu item removal code
yishn/Goban,yishn/Sabaki,yishn/Sabaki,yishn/Goban