Merge pull request #242 from gorthauer/master

Compile fixes and polishing for clang.
[multimediabackend] ported to qt5 & added to build
Merge pull request #241 from trett/master

[multimediabackend] ported to qt5 & added to build
Fixed duplication of outgouing messages in MUCs
Added muc role icons and unknown-client icons
Fixed position of icons in contact list
[sdlsound] added to buid
Merge pull request #247 from trett/master

[sdlsound] added to buid