Interface implemented by classes who wish to handle actions.
Parameters
target
The target handler to list actions for. For item containers this is the item id.
sender
The party that would be sending the actions. Most of this is the action container.
Returns the list of actions applicable to this handler.
Parameters
action
The action to be handled
sender
The sender of the action. This is most often the action container.
target
The target of the
action
. For item
containers this is the item id.
Handles an action for the given target. The handler method may just discard the action if it's not suitable.