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

[Alex Nemeth]

anemeth added reviewers: Plasma, KWin, graesslin.
Restricted Application edited projects, added Plasma; removed KWin.
Restricted Application added a subscriber: plasma-devel.

REPOSITORY
  R108 KWin

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

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