QEMU Extended Key Event extension

Hi,

Seems like Jump does not support QEMU Extended Key Event extension, considering all the symptoms are similar to when TurboVNC was adding it in their new version [1]. This causes problems with wayvnc, which relies on the extension.

Please add the support for it, so I can use all the key combinations, eg ctrl+shift+backtick.

Thank you!

[1] https://github.com/TurboVNC/turbovnc/issues/377#issuecomment-1784997763