Refactor codebase to make use of transaction

[Regent L'Archeveque]

Overall strategy

We should keep in the transaction domain the elements that are modified by the user.

• Reduce getter/setter @generated_NOT
• Implement code logic in the core Facade (without transaction)
• Implement code transaction in the UI facade

Impacts

The following Invocator Session components must be removed:

• Topology
• Instances
• Registered Types
• Current Time Time Sources

[Regent L'Archeveque]

Issue #46 was marked as a duplicate of this issue.