ProjectExplorer: Use explicit namespace
ProjectExplorer: Use explicit namespace

Change-Id: I923b856170f1c4ddd48da2434bf77d4b46da8d99
Reviewed-by: Eike Ziller <c142da16c73a95a82d35191bcc55b22835617128@theqtcompany.com>

kuba1/qtcreator,martyone/sailfish-qtcreator,xianian/qt-creator,kuba1/qtcreator,Distrotech/qtcreator,Distrotech/qtcreator,xianian/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator,danimo/qt-creator,Distrotech/qtcreator,xianian/qt-creator,danimo/qt-creator,Distrotech/qtcreator,kuba1/qtcreator,xianian/qt-creator,danimo/qt-creator,danimo/qt-creator,kuba1/qtcreator,danimo/qt-creator,danimo/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,kuba1/qtcreator,kuba1/qtcreator,danimo/qt-creator,Distrotech/qtcreator,martyone/sailfish-qtcreator,kuba1/qtcreator,Distrotech/qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator,kuba1/qtcreator,xianian/qt-creator,xianian/qt-creator,xianian/qt-creator,Distrotech/qtcreator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,xianian/qt-creator,kuba1/qtcreator,xianian/qt-creator