* update copyright
* fix css parsing
* fix block name search
* add matching text highlighing for find results
* add calculation of block statistics for selected area
* new action: right-click on a block on "Diagram" selects region using left and right bounds of this block
* other optimizations
#112 [UI] Fixed losing focus (and getting under MainWindow) for Blocks widget.
#0 [UI] UI styling, added custom window header and dialogs (could be turned off/on and adjusted position at [Settings -> Appearance] menu).
