D22151: [plugins/qpa] Code tidying

zzag created this revision.
zzag added a reviewer: KWin.
Herald added a project: KWin.
Herald added a subscriber: kwin.
zzag requested review of this revision.

REVISION SUMMARY
  This change cleans up includes, fixes coding style issues, etc.

TEST PLAN
  Compiles.

REPOSITORY
  R108 KWin

BRANCH
  qpa-offscreen-surface

REVISION DETAIL
  https://phabricator.kde.org/D22151

AFFECTED FILES
  plugins/qpa/abstractplatformcontext.h
  plugins/qpa/backingstore.cpp
  plugins/qpa/integration.cpp
  plugins/qpa/integration.h
  plugins/qpa/nativeinterface.cpp
  plugins/qpa/screen.cpp
  plugins/qpa/sharingplatformcontext.cpp
  plugins/qpa/sharingplatformcontext.h
  plugins/qpa/window.cpp

To: zzag, #kwin
Cc: kwin, LeGast00n, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart