[CMakeLists] add basic CmakeLists and main.cpp file.
add basic classes CoreWindow and CoreGLWidget
[Node] add class Node with list of Nodes object and with basic method. Most important is drawChildren, that draw all Nodes in list - every child call pure virtual method drawMe().
[Node] add draw() method, update drawChildren() method.
[CoreDrawer] add class CoreDrawer with Node *root and method drawtree().
[CoreGLWidget] update constructor, add _coredrawer.
[CoreWindow] add parameter QGLWidget to constructor.
[CoreController] add class CoreController.
[main] update to use CoreController.
[Cube] add vertex array cube
[Node] add computeMetrics() method
[Node] 1 prototyp of layot
[CoreGLWidget] add mouse rotation
[CoreGLWidged] fixed transparency
create module layout
[Manager] add manager singleton class with loadFile method
[GraphMLImporter]
[Graph] update Importer to call addNode/addEdge methods and manager to return graph
[Graph, GrEdge, GrNode] add graph's Node and Edge class
[Graph] add method createSpanningTree()