Management of inputs in Control, Management of callbacks creator per input in Source, Saving and Loading in Session, Unified renaming of SourceCallbacks, User interface window for creating and editing input mapping from Keyboard and Numerical keypad, with appropriate Settings.
Updated SourceCallback class to accept cloning, reversing, and visitors for saving./loading. New mechanism in Source to listen to key triggers for launching SourceCallbacks. Saving and loading in SessionVisitor and SessionCreator.
Similarly to Node update callbacks, sources now have SourceCallbacks called at the start of each update. Several SourceCallback are implemented to ensure thread safe update of more complex properties (mixing alpha, depth, etc.).
