SpeedDial: Replaced facebook with duckduckgo as default page

Closes #990
Set DuckDuckGo as a default search engine
Fix using external download manager with use defined location setting.

Closes #984
Fixed closing tabs from TabsMenu by middle-click
Make SchemeHandler destructor virtual
License Viewer: Use Courier font + small visual tweaks

Added close button and changed default size
Typo fix in cookie manager
Merge branch 'master' of github.com:QupZilla/qupzilla
Updated translations
Latest stable version is 1.4.4
[Windows] Fixed disabling transparent effect when composition is disabled by OS.
Fixed, update icon of detached tab.
Added possibility to save and retrieve proxy passwords
Updated Windows installer
Merge branch 'master' of https://github.com/QupZilla/qupzilla
Updated CA bundle
Added hint for building on Fedora (qmake versions)

On Fedora you have:
qmake (Qt 3)
qmake-qt4 (Qt 4)
qmake-qt5 (Qt 5)
So using `qmake` does not work since qupzilla is designed for Qt4/Qt5.
Merge pull request #1021 from genodeftest/patch-1

Added hint for building on Fedora (qmake versions)
Merge pull request #1009 from jdbastardy/master

Added possibility to save and retrieve proxy passwords
added internet explorer import