ConstList registered system hotkeys followed by local shortcuts. The shortcut entries go away
with registerShortcut in 3.0.
Register a system-wide hotkey; the response carries the numeric id. The hotkey is
released when this page navigates or reloads and when its window closes.
Store a key combination under an action name. Nothing matches key presses against it.
Replace this page's reserved keys: combinations that stay with the page while it has the
focus, even when foobar2000 has a keyboard shortcut for them. Cleared when the page
navigates or reloads; an empty array releases them all. With { all: true } every key
stays with the page, for example while it records a shortcut; call again without it to
keep only keys.
Takes exactly one of the numeric id and the original key string. Removing a shortcut
by key goes away with registerShortcut in 3.0.
keyboard— hotkey / shortcut registration namespace.