Issue-Ref: 3891
Issue-Url: https://af3-developer.fortiss.org/issues/3891



Signed-off-by: Johannes Eder <eder@fortiss.org>

* Add a default dialog and handler class.
* Move the main parts of the service from the base plugin to the kernel.
* Introduce a severity enum since using int "codes" is flawed and we do
  not use underlying eclipse methods like the logging methods in the
  LoggingUtils class.

Issue-Ref: 3574
Issue-Url: https://af3-developer.fortiss.org/issues/3574


Signed-off-by: Alexander Diewald <diewald@fortiss.org>

Signed-off-by: Alexander Diewald <diewald@fortiss.org>

refs 3177

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KISS: ObjectAware2ServiceBase and ObjectAwareServiceBase now inherit from IIntrospectiveKernelService
refs 2566

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Extracted LightWeightLabelProvider into separate class in order to avoid instantiating marker service twice.
refs 2461

Added introspection GUI and made all relevant services implement IIntrospectiveKernelService. Found a bug with marker service (see bug 2461).
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Some cleanup of code => YELLOW.
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trial for undo/redo fix

added GEF editor base and edit part factory service

added IConnector extensions
implemented IConnectorService
cleanup => some YELLOW