(profiler_gui) Added possibility to change where chronometer (time-meter) item text will be painted: at the top of the scene, in the center or at the bottom of the scene. See menu View -> Chronometer text.
(profiler_gui) Moving sources into separate files;
(profiler_gui) Rename Prof* classes into Easy*;
(EasyGraphicsView) Optimized performance by not painting items which were not expanded in TreeWidget. While there are no range selected for TreeWidget, only top-level blocks are painted on scene.
