Task->ExU mappings & feature-driven transformation

...rg/fortiss/af3/exploration/alg/dse/backend/opt4j/.ratings

...se/backend/opt4j/Opt4JExplorationSolutionTransformer.java

.../fortiss/af3/exploration/alg/feature/taskmapping/.ratings

...ation/alg/feature/taskmapping/TaskMappingExploration.java

...tion/alg/feature/taskmapping/TaskToExUTransformation.java

....alg/src/org/fortiss/af3/exploration/alg/service/.ratings

...ration/alg/service/IExplorationTransformationService.java

.../exploration/alg/service/internal/transformation/.ratings

...rnal/transformation/ExplorationTransformationService.java