Implemented graphic visualization of cluster in solution view

src/main/java/de/hhu/ba/yoshikoWrapper/CyActivator.java

...ain/java/de/hhu/ba/yoshikoWrapper/core/AlgorithmTask.java

src/main/java/de/hhu/ba/yoshikoWrapper/core/CyCore.java

...a/de/hhu/ba/yoshikoWrapper/graphModel/YoshikoCluster.java

.../de/hhu/ba/yoshikoWrapper/graphModel/YoshikoSolution.java

src/main/java/de/hhu/ba/yoshikoWrapper/gui/ClusterView.java

src/main/java/de/hhu/ba/yoshikoWrapper/gui/MainPanel.java

src/main/resources/YoshikoStrings.properties