DI: Prototype for ExplorationModule service based decoding.

* YELLOW: ExplorationExceptions.
* Add ExplorationServiceRuntimeExceptions for cases where no exceptions
  may be thrown (e.g., startup methods).
* Modify the ExplorationModule service such that instances of them must
  be registered instead of their types (no-arg constructors).
* Add the ExplorationModule service to the plugin startup class.
* Register the FailSilentTaskMappingDecoder.
* Adjust the FailSilent- and FaultTolerantTaskMappingDecoder such that
  they use the new Guice DI mechanism.
* Remove the creation methods of the above decoders from the DSE
  factories.

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