[DiagramTemplate] Refactor existing custom code

- Add new utils classes (to be redistributed in Papyrus)
- Split DiagramTemplateLauncher into several classes
- Create new creation commands
- Add a List to filter out problematic diagrams

Change-Id: I08735da242eff9ff5c60f7500b0b13cfba160f40
Signed-off-by: Quentin Le Menez <quentin.lemenez@cea.fr>