D11313: Refactor GCSlider

[Alexis Breton]

abreton added a task: T8182: Refactor GCSlider to avoid duplication.

REPOSITORY
  R2 GCompris

REVISION DETAIL
  https://phabricator.kde.org/D11313

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