Instead of using QWebPage and then loading the whole page in order to
get icon, it is now using own IconFetcher class.
It simply download page, looks for <link rel=shortcut and downloads icon
from here. If no <link rel=shortcut is present, the downloading standard
favicon.ico from base directory.
Finally added support to manage search engines. You can add search
engines from sites that supports opensearch standard, but you can also
add them manually.
There is also possibility to specify shortcuts for quickly searching in
location bar on your favourite engines.
Namely menu indicator on back and home buttons removed, using own menu
indicator on websearchbar (default Qt is way too big on some themes)
Added Ján Ďanovský to translators (Slovak translate fixed)
