Web History plugin implementation.

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	Property	Description
	HistoryChannel	EventChannel access for HistoryPlugin plugin.

	Interface	Description
	HistoryStrategy	Implemented strategies used by HistoryPlugin must implements HistoryStrategy interface.

	Class	Description
	HistoryPlugin	History plugin.
	HistoryStatus	History status structure.
	Importer	HistoryPlugin class importer for I.O.C. compilation.