gui: Implement go back to welcome screen from editor view
requested to merge feature/6_import_export_puzzle/gui_back_to_welcome_screen into feature/6_import_export_puzzle/main
Closes #79 (closed).
All the scenes are preloaded and attached as properties of the application's main stage at application startup.
Then, upon switch view events, controllers retrieve the desired scene from the stage properties and set it as the stage's scene.
Probably not the most efficient way to handle multiple scenes, but it does work and is arguably simple.
Edited by Antoine Belvire