* holding down back or forward button shows list of current back-forward stack
* added narrow button between back and forward to show the list
* added History menu
* moved back and forward actions to History menu
* show chronological list of recently active symbols in History menu
bug id = 151
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* fulltextsearch enabled in sqlite
* fulltextsearch start search with @
* codeview performance improved
* strip sRGB profile from png files to get rid of libpng warning at runtime
* enabled highDpi icons in QApplication for Searchbar Icons
* realigned StartScreen contents
* showing version number 0.1
* "Search" as placeholder text in SearchBar
* same content margins for each dockwidget view
* brighter variable color in Graph
* press ESC to close StartScreen
Eberhard Graether