Allow users to change keyboard shortcuts with keyboard only

[vedmakk]

See: JohannesKlauss/react-hotkeys-hook#1267

[vedmakk]

Waiting for JohannesKlauss/react-hotkeys-hook#1268 to be merged and published.

[vedmakk]

• Add navigational keys (Esc, Tab, Enter, Space, Arrows, ...) to blacklist, so that the user can still change focus and activate buttons when editing shortcuts.
• Fix bug: ESC when in edit shortcuts mode -> cancels without unregistering event listeners (because menu closes).
• Change menu-toggle shortcut. (Default Esc isn't ideal, because it's used to cancel things)
• Check keyboard shortcuts info for correctly labelling (are the hotkey buttons correctly labelled for a screenreader?)
• Allow disabling all shortcuts (and save it in local storage)