Moving gluon, gluon-blocks, ksokoban and libtagaro from playground-games to unmaintained

[Albert Astals Cid]

https://cgit.kde.org/ksokoban.git/log/
https://cgit.kde.org/libtagaro.git/log/
https://cgit.kde.org/gluon.git/log/
https://cgit.kde.org/gluon-blocks.git/log/

All of the 4 are still qt4 based

All of them haven't had any meaningul commit in a long time

Anyone against us moving them away from the "playground" virtual location to the "unmaintained" one?

At least saves some translators that may spend time translating them for no real reason.

Cheers,
  Albert