[OSX] YACReader quits when last window closes

[MaddTheSane]

This is contrary to how other Mac OS X apps work.

[prantlf]

Yes, behaving similarly to other Mac applications in going full-screen, closing the window, quitting the application (Ctrl+Cmd+F, Cmd+W, Cmd+Q) would help the adoption on the Mac platform. On the other hand, I got used to the behaviour of Esc pretty quickly :-)