Update graph labels

...ysis/trace/traversal/AbstractTraceToGraphTransformer.java

...analysis/trace/traversal/AggrTraceToGraphTransformer.java

...ker/analysis/trace/traversal/AggrTraceTraverserStage.java

...ker/analysis/trace/traversal/TraceToGraphTransformer.java

.../kieker/analysis/trace/traversal/TraceTraverserStage.java

src/main/java/kieker/analysis/util/Mapper.java

src/main/java/kieker/analysis/util/NameConverter.java