[Bookmarks] Fixed assert when migrating bookmarks

Assert when user had bookmark with folder that doesn't exists
Also save bookmarks as soon as they are migrated

Closes #1213
[TabListButton] Show popup menu inside window for tab-list button in tabbar
[TabBar] Don't show tab previews while dragging tabs
[Flicker] Another set of flicker patches

Old approach caused navigationbar to be empty for a moment while
opening a lot of tabs at once
Updated translations from Transifex
[Building] Fixed building on OS/2
[Windows] Use %LOCALAPPDATA% only if user doesn't have config in older paths
FreeBSD build patches

Imported from http://svnweb.freebsd.org/ports/head/www/qupzilla/files/
See #1206
[SslV3Sites] Added possibility to change list of sites in settings.ini

In settings.ini: Web-Browser-Settings/SSLv3Sites

Also added sermapa.es to default list
Merge branch 'master' of https://github.com/QupZilla/qupzilla into tass