Make the hotkeys work only when the game window is focused.

[SmileLikeGod]

Make the hotkeys work only when the game window is focused.

[marcincichocki]

This would require hook to win32 API which is unavailable from node.js land(probably could be done with node-ffi-napi), and I have no idea as of now how to replicate that on Linux. But overall interesting idea, that I might revisit at some point in the future.