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Add the SelectableNavigator protocol #188
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Added
SelectableNavigatorprotocol for navigators supporting user selection.navigator(_:canPerformAction:for:)to validate each editing action for the current selection. For example, to make sure the selected text is not too large for a definition look up.navigator(_:shouldShowMenuForSelection:)to override the default edit menu (UIMenuController) with a custom selection pop-up.Note: This is not yet implemented by any navigator. The EPUB navigator requires code that is coming in the Decorator PR (#186).