* core: NodeChunks are now stored in a ListModel inside Node
* ui: introduce SortedModelByReference
* ui: UIGraph exposes a proxy model of its graph's nodes sorted as visited by DFS (instead of another model of chunks)
* ui: added NodeChunks Component
First functional UI that allows to visualize, modify and execute a graph locally.
* use QtQuick Controls 2 + Shapes (Qt >=5.10)
* main menu to save/load a graph