Move KCalCore and KContacts to Frameworks from PIM.

As part of this move, KCalCore will also be renaming to KCalendarCore.

As agreed with Frameworks and Applications release maintainers, along with the respective maintainers of KCalCore and KContacts.

Ref T11659

CCMAIL: kde-pim@kde.org
CCMAIL: kde-frameworks-devel@kde.org
CCMAIL: release-team@kde.org