Merge pull request #240 from Hamper/qt4

Qt4 backports
Merge pull request #243 from Hamper/qt4

Qt4 backports
Merge pull request #244 from Hamper/qt4

Qt4 backports
Merge pull request #245 from Hamper/qt4

Qt4 backports icons fix
Merge pull request #246 from Hamper/qt4

update artwork submodule
Merge pull request #248 from Hamper/qt4

new artwork style
Merge pull request #250 from Hamper/qt4

Qt4 backports (search)
Merge pull request #251 from Hamper/qt4

Qt4 backports and update submodules
Merge pull request #253 from Hamper/qt4

[adiumwebview] fixes for context menu
Merge pull request #264 from Hamper/qt4

Qt4 backports
Merge pull request #268 from Hamper/qt4

Qt4 backports
[urlpreview] url filter was added
[urlpreview] checkBox for RCA added
Merge pull request #275 from trett/qt4

Qt4
[urlpreview] added forgotten header
Merge pull request #277 from trett/qt4

[urlpreview] added forgotten header
[urlpreview] fix for empty settings
Merge pull request #279 from trett/qt4

[urlpreview] fix for empty settings
fix cmake errors