preview of emoticons
error handling for missing graphical icons

preview of emoticons based on dynamic list of emoticons, not hardcoded anymore
yup, too many brackets
Merge remote-tracking branch 'upsteam/master' into emoticon-preview
removed duplicated emoticons
fix #436
I learned some things: improve thread safety
Italian translation: update
auto away; needs UI
Merge branch 'pr439'
Merge branch 'pr440'
Merge branch 'pr441'
Merge branch 'pr419'
style selector

Unfortunately Qt developers removed some old native skins from support, only 3 skins are supported on Linux.
Number of native skins depends on OS and Qt built system.
Merge branch 'pr421'
VideoSurface: aspect ratio
partial fix for #426
CameraWorker: cleanup, poll at 60Hz
simplified VideoSource, interface, BRG->YUV conversion changes + more
NetVideoSource, YUV shader, fixes