D8094: Port RuleBook::discardUsed from Client to AbstractClient

[Bhushan Shah]

bshah accepted this revision as: Plasma, bshah.
This revision is now accepted and ready to land.

REPOSITORY
  R108 KWin

BRANCH
  rulebook-discardused-abstractclient

REVISION DETAIL
  https://phabricator.kde.org/D8094

To: graesslin, #kwin, #plasma, bshah
Cc: plasma-devel, kwin, bwowk, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
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