Optionallabela label for an action, mwg never invents a display name of its own
OptionalonAsked before a captured key already claimed by another action is taken from it -
Input.actionsForKey (item 94) is exactly the query behind previousOwners. Return
false to refuse the capture and leave every binding untouched, for a game that wants
to warn and ask first rather than silently losing the old binding. Omit it to always
take the key over, which is this screen's default.
Optionalrow
which actions to list, and in what order