Control-q should quit the program

[Porkepix]

Describe the problem

As for most of the other programs and excepted when it's bind to something else, control-q could just quit the program.

Describe the solution you'd like

Control-q could quit the program.

Alternatives considered

I guess it falls back to alt-f4 (unless something is bind at the desktop environment level), which is less handy and uniform accross OS.

Additional context

No response

[kfiven]

duplicate of #204