D8637: Use nullptr + add explicit keyword

[Laurent Montel]

mlaurent created this revision.
Restricted Application added a subscriber: Dolphin.

TEST PLAN
  compile

REPOSITORY
  R318 Dolphin

BRANCH
  use_nullptr_and_explicit

REVISION DETAIL
  https://phabricator.kde.org/D8637

AFFECTED FILES
  src/dolphincontextmenu.cpp
  src/dolphindockwidget.cpp
  src/panels/folders/folderspanel.cpp
  src/panels/folders/folderspanel.h
  src/panels/information/filemetadataconfigurationdialog.cpp
  src/panels/information/informationpanel.cpp
  src/panels/information/informationpanel.h
  src/panels/information/phononwidget.cpp
  src/panels/places/placesitem.cpp
  src/panels/places/placesitemsignalhandler.h
  src/panels/places/placespanel.cpp
  src/panels/places/placespanel.h
  src/panels/places/placesview.h
  src/panels/terminal/terminalpanel.h
  src/search/dolphinfacetswidget.cpp
  src/search/dolphinfacetswidget.h
  src/settings/general/behaviorsettingspage.cpp
  src/settings/general/statusbarsettingspage.cpp
  src/settings/startup/startupsettingspage.cpp

To: mlaurent
Cc: #dolphin
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