Updated translations; added Russian, Ukrainian
Get known image formats from QImage data in QClipboard
Translated using Weblate (Ukrainian)

Currently translated at 0.4% (3 of 607 strings)
Merge remote-tracking branch 'origin/master'
create_source_package.sh checks if version is in CHANGES
Add offset options for notifications
Show "snip" tray icon even for quick command like "toggle"
Fix encoding issue for "config" command