All actions are now saved in QHash with name, this will make possible
to implement own keyboard shortcuts for actions.
+ WIP cleanup of BrowserWindow class
The menu is now displayed inside window, even when window
is not in fullscreen.
It now also contains the most important actions in addition to copy of
top level menus.
* move helper-functions in navigationbar.cpp into NavigationBar [private]
* remove (unused) 2nd arg in WebSearchBar/NavigationBar and use mainClass as parent.
* remove NavigationBar-destructor (not needed)
* remove WebSearchBar::m_menu and create a QMenu-instance directly in WebSearchBar::contextMenuEvent()
