- instead of creating new QSettings objects whenever we want to
save some data, we are using global QSettings object that is
keeping its data in memory and writing to disk only when
really needed
- it is now possible to close page search with Esc, it is no longer
needed to click on close button.
- shortcuts for reload, stop, next, back are available everytime.
- performance of cookie manager is not ideal yet, but it is much better
than it was before.
- fixed showing search engine name in locationbar placeholder text.
- updated ca-certs bundle by latest Debian update
- moved keypressevent handler from WebView to QupZila to make this
actions global
- added keypress actions for special keys on keyboard
