D9848: Updated the blur method to use the more efficient dual kawase blur algorithm.

[Sebastian Krzyszkowiak]

Restricted Application edited projects, added KWin; removed Plasma.

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9848

To: anemeth, #plasma, #kwin, fredrik
Cc: luebking, broulik, romangg, zzag, anthonyfieroni, mart, davidedmundson, 
fredrik, ngraham, plasma-devel, kwin, #kwin, iodelay, bwowk, ZrenBot, 
progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, 
apol