LDEV-3171: Give a Monitor an option to remove learner's content from activities when moving him backwards in a sequence.Implementation of content-removing method for most of tools.
LDEV-3156: Put back missing methods, removed along with Flash Monitoring. Manually add session cookies to WebConversation if it is not done automatically. Make TestHarness work with Leader and Scratchie tools.
LDEV-3115: Save LD preparations. Adapt ObjectExtractor so it reads from JSON.Add "Save" and "Save as" buttons. Allow choosing where to save the LD, along with some validation. Partial LD serialization.