Rework list of closed tabs
Merge pull request #1217 from pejakm/tabwdgt

[Tabwidget] Rework list of closed tabs
[ChromeImporter] Support importing full bookmarks structure
[OperaImporter] Support importing full bookmarks structure
[BookmarksImportDialog] Draw separators in imported bookmarks treeview
[SpeedDial] Fix overlay text input visibility with dark themes
[FirefoxImporter] Support importing full bookmarks structure
[Bookmarks] Added Export dialog + HTML Bookmarks Exporter
Merge pull request #1218 from pejakm/sdfix

[SpeedDial] Fix overlay text input visibility with dark themes
[AutoScroll] Added AutoScroll plugin

I'm still looking for some icon. For now, only red square is shown.
1.6.3 is current stable version
[PACtest] qupzilla.com is now on own VPS
[AutoScroll] Add scrolling icons (from Oxygen cursor theme)

Also scroll timer interval is now 10 msecs, so scrolling will be a
little faster.
[LocationCompleter] Speedup searching in Bookmarks & History

See #1135
[AutoScroll] Added settings - option to change scroll divider value
[Plugins] Updated translations
[Translators] Added Juan Carlos Sánchez into translators
[AutoScroll] Set minimum value of divider to 1.0
[AutoScroll] Set window title of settings dialog
[Cleanup] Renamed QupZilla class to BrowserWindow