[2389] Add support of inheritance of subject in _subject_ compartment

[jerome-obeo]

Add support of inheritance of subject in subject compartment of CaseDefinition and CaseUsage graphical nodes.
The subject compartment is also visible in the following graphical nodes:

• RequirementDefinition
• RequireUsage
• ConcernDefinition
• ConcernUsage
• SatisfyRequirementUsage

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