D11900: Mosiac activity, rework UI using GridView by replacing Grid and implement keyboard controls.

[Aman Kumar Gupta]

amankumargupta marked an inline comment as done.

REPOSITORY
  R2 GCompris

REVISION DETAIL
  https://phabricator.kde.org/D11900

To: amankumargupta, #gcompris_improvements, jjazeix
Cc: #kde_edu, #gcompris_improvements, himanshuvishwakarma, harrymecwan, ganeshredcobra, nityanandkumar, echarruau, rahulyadav, narvaez, scagarwal, apol, timotheegiet, hkaelberer, jjazeix, bcoudoin
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