[eclass] Avoid pinning applications to a certain slot.

With each applications release being mixed KDE4/KF5, there's no way to know
which package belongs to which slot.
[eclass] Introduce KDE 5 meta package eclass.
[kde-apps/kdeedu-meta] Update for KDE Applications.

Package-Manager: portage-2.2.14
[kde-apps/kdeedu-data] New package.

Package-Manager: portage-2.2.14
[kde-apps/kdeedu-meta] Add new packages.

Package-Manager: portage-2.2.14