Update main.cpp

First of all we added some new header files like QTimer,ObserverBar,ObserverGraph,ObserverText.....
We have to add these because the have seperated the code from the other cpp files (ObserverBar,ObserverGraph,ObserverText) so we can create the Graphs in the main.
Besides, we have all made ​​everything clearer by sorting all part like barchart,curvechart,label,controller and main.
Some code is still commented maybe we need it later.