Allow to set off global shortcut.

[gluwer]

Can you make the global shortcut customizable or at least the option to turn it off?

In Polish we use Alt Gr+O for writing ó. At the moment the desktop app is hardly usable because of hardcoded shortcut.

[tjbck]

Added with the latest.

[jaroslawjanas]

@tjbck
Yo, thanks for a screenshot or even a link to the commit.
Much use for me trying to find this setting, which I don't see btw.