Implement Close Button

[Xphalnos]

I implemented the Close button because before when you press it nothing happens.

Video Demo:

close_button.mp4

[polybiusproxy]

I'm not sure if this should be merged. This is, at the moment, just an alternative to closing the game window, which results in a crash.
Ideally we'd want to have proper destruction of everything on the emulator, take for example, the renderer.

[Xphalnos]

I'm not sure if this should be merged. This is, at the moment, just an alternative to closing the game window, which results in a crash. Ideally we'd want to have proper destruction of everything on the emulator, take for example, the renderer.

I agree but for now it's a very basic implementation of this button.