Some more refactoring

src/main/java/sinalgo/gui/ProjectSelector.java

src/main/java/sinalgo/gui/controlPanel/ControlPanel.java

.../java/sinalgo/gui/controlPanel/MaximizedControlPanel.java

.../java/sinalgo/gui/controlPanel/MinimizedControlPanel.java

src/main/java/sinalgo/gui/controlPanel/ZoomPanel.java

src/main/java/sinalgo/io/xml/XMLParser.java

src/main/java/sinalgo/nodes/edges/Edge.java

src/main/java/sinalgo/tools/Tools.java

src/main/java/sinalgo/tools/storage/DoublyLinkedList.java

...ain/java/sinalgo/tools/storage/DoublyLinkedListEntry.java