Fixes #4924. Setting Shortcut.Key to Key.Empty now removes the key binding#4925

tig merged 3 commits intodevelopgui-cs/Terminal.Gui:developfrom

pr/4919-kitty-keyboard-protocol-alt-gr-fixgui-cs/Terminal.Gui:pr/4919-kitty-keyboard-protocol-alt-gr-fixCopy head branch name to clipboard