FDP:
1) Removed the "scenarioId" attribute from the "tag" tag in the scenario
configuration.
2) Added "onOpen", "onClose" and "onCharacters" attributes to the "tag"
tag in the scenario configuration to support feature of reaction on tag
opening, closing and characters events respectively.
3) Added "characterAttribute" attribute to the "tag" tag in the scenario
configuration which substitutes nested characters encounter inside user
tags for an attribute with the given name.