Add some todos (ctrl-f 'TODO @Nico')
Add API submodule
Begin implementation of the undo / redo for the event creation
Uncomment wrongly commented line
Restyle files with astyle
Fix build error
TO AMEND
Work on the architecture of Scenario
Plug-in interface for the inspector
Organization of Scenario which follows the proposed class diagram
Update inspector interface to take Nicola's work into account
Begin implementation of the models.
Fix build
Continuous work on scenario model implementation
Base implementation of the most important models for Scenario
Move commands to Scenario rework
s/relation/interval
General identification of objects
Work on the tests; add find by id
Add test cases