Change; feature; fix; refactor

* Use Qt coding style, sort includes, class members, etc. in BeQtWidgets
* Add new methods to BAboutDialog
* Remove BApplication::createStandardAction method
* Move BApplication::SettingsTabNavigation enum to BSettingsDialog (change related methods)
* Reimplement BClipboardNotifier
* Improve BLocalTerminalDriver builtin commands handling ("cd")
* Add new methods to BPasswordWidget and BLoginWidget
* Implement BTerminalWidget history
* Improve BTerminalWidget event handling