Support switching keyboard layouts

As noted in issue #5, xkbcat would previously not react at all to
keyboard layout changes; it would continue to print keysyms according to
the first keyboard layout X was started with.

Keyboard keysym group changes (i.e. keyboard layout changes) are
listened to as separate events, so if you only use 1 layout, this causes
no performance overhead.

Closes #5.

Thanks to @unxed for very helpful research.

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