Create a CompositeIcon from the specified Icons,
using the default relative position (icon1 above icon2)
and orientations (centered horizontally and vertically).
Create a CompositeIcon from the specified Icons,
using the specified relative position
and default orientations (centered horizontally and vertically).
A CrossWire Action is a generic extension of AbstractAction,
that adds LARGE_ICON to Action and also forwards the Action
to its listeners after modifying the ActionEvent to include
the ACTION_COMMAND_KEY.