Motivated by #695 which targets broader task, Ctrl-Q behaviour is one
that stands out. Accidentally pressing it instead of Ctrl-W can have
disasterous consequences or is annoying. Other browsers provide either
generic keyboard shortcuts configuration (Opera) or an extension/plugin
to disable the behaviour (FF).
For the record of the usability demand:
https://code.google.com/p/chromium/issues/detail?id=59621https://bugzilla.mozilla.org/show_bug.cgi?id=550559
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
