Move "Kexi libs" to extragear-libs, track stable i18n
They are libraries with their own release schedule, so put them
into the logical namespace extragear/libs.
The new CI system gives (correctly) less or no importance
to namespaced grouping as primary key, as it was before.
We can then discuss whether "move" kexi itself to extragear-office
and krita to extragear-graphics, but... not today!