+ in index.html: added simulator js and css files and menu options

+ added timelineController and simulationController
+ added simulator.html containing code to be loaded on demand by jquery
# changed fromJSON() in ContextInformation and ContextInfoList: the former now makes a "deep cast" incl. parameters, simplifying the latter
+ added reset functions to Parameter, ContextInformation and ContextInfoList for resetting chosen values to ""
+ added getScenarioContext() to Scenario and getContextInformation() to AuthorSystemContent: return lists of context items added to units in the author system
+ added hasContext() to Scenario and AuthorSystemContent: returns true if context has been added to a unit by the author
- removed now superfluous event handler from main (was there for testing download)
+ added new event handler to simulatorController