(EasyGraphicsView) Scale indicator rework;
(EasyMainWindow) Added menu "View" with actions "Expand all" nad "Collapse all";
(EasyGraphicsScrollbar) Fixed wrong mouse position calculation when scaling (with mouse wheel) on minimap.
(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.