Variability: Provide extension point for enriching configuration names

[kbirken]

This PR introduces an extension point for application-specific enriching of configuration names. The default extension for this ensures that nothing is changed at all. The interface IEnrichedConfigNameLogic specifies the API for the extension.

A dozen of test cases has been implemented. They use an extension SomeEnrichedNameLogic which can be activated by the tests by lifting its priority.

In order to test the functionality manually in the IDE, just temporarily increase SomeEnrichedNameLogic .myPriority to a value above zero. Then the test extension will be activated in the IDE. Then the enriched names will be shown for the configuration examples in the tests, e.g.:

Or for references (see rack1):

The CHANGELOG has been updated.

This solves #1598.

[dbinkele]

@kbirken der Kommentar, sagt wenn ‘false’ dann enriched, der Methodenname sagt aber das Gegenteil (oder?)

[dbinkele]

@kbirken Priorities are ordered 'asc'

But there are others where it is ordered 'desc'.... to keep things simple, there should only be one way.
See: http://127.0.0.1:63320/node?ref=r%3A83d54567-d361-47ca-a949-7374ea89921d%28org.iets3.variability.configuration.base.plugin%29%2F2221974065919945886

http://127.0.0.1:63320/node?ref=r%3Aaeef8772-8af4-45c3-a762-623d4009d953%28org.iets3.variability.base.plugin%29%2F3460963097070249416

http://127.0.0.1:63320/node?ref=r%3A154fabcc-b3d3-4e79-bb19-4903ef6965db%28org.iets3.variability.artifacts.base.plugin%29%2F1594803562778800770

[dbinkele]

@kbirken some stale commented code needs removal http://127.0.0.1:63320/node?ref=r%3A01d36390-adf4-48cb-a3e7-d99f41d89a60%28test.org.iets3.variability.configuration.base.enrichedNames%40tests%29%2F7493231619832131126