move dot utils

src/main/java/kieker/analysis/util/IndentWriter.java → src/main/java/kieker/analysis/graph/util/IndentWriter.java

-package kieker.analysis.util;
+package kieker.analysis.graph.util;
 
 import java.io.IOException;
 import java.io.Writer;

src/main/java/kieker/analysis/util/dot/DotGraph.java → src/main/java/kieker/analysis/graph/util/dot/DotGraph.java

-package kieker.analysis.util.dot;
+package kieker.analysis.graph.util.dot;
 
 public final class DotGraph {
 

src/main/java/kieker/analysis/util/dot/DotGraphType.java → src/main/java/kieker/analysis/graph/util/dot/DotGraphType.java

-package kieker.analysis.util.dot;
+package kieker.analysis.graph.util.dot;
 
 public enum DotGraphType {
 

src/main/java/kieker/analysis/util/dot/DotWriter.java → src/main/java/kieker/analysis/graph/util/dot/DotWriter.java

-package kieker.analysis.util.dot;
+package kieker.analysis.graph.util.dot;
 
 import java.io.IOException;
 import java.io.Writer;
 import java.util.Map;
 import java.util.stream.Collectors;
 
-import kieker.analysis.util.IndentWriter;
+import kieker.analysis.graph.util.IndentWriter;
 
 /**
  * Class to build and write a DOT Graph to a writer.