Add 3.10 to metadata.json.
Merge branch 'master' into gs310.
Added credits for Ukranian translation.
Changed Gnome-Shell to GNOME Shell through out the whole project.
Updated Russian translation.
Removed unnecessary call to hide().
Removed template.
Removed new-extension.
	modified:   yawl/po/uk.po
	modified:   yawl/po/uk.po
	modified:   yawl/po/uk.po
Lib: correct link in preferences dialog.
Merge pull request #12 from uukr/gs310

Updated Ukrainian Translation.
Changed a string for translation.
Lib: changed some strings for translation.
Updated translations with trailing spaces removed.
Lib: allow rounded animation.
Shift attention icon to the right.
Lib: allow SlicerActor to be "hovered" by other actors.
Lib: Make sure min_width is a whole number during animation.