External editors: Fall back to path if not found in Qt version.
External editors: Fall back to path if not found in Qt version.

Use Designer/Linguist executables from path if (embedded)
Qt version does not ship them.

Task-number: QTCREATORBUG-4826
Change-Id: Ide2fe0e59a8ea8f93a9193e0f97877631ce68470
Reviewed-on: http://codereview.qt.nokia.com/502
Reviewed-by: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Eike Ziller <c142da16c73a95a82d35191bcc55b22835617128@nokia.com>
Reviewed-by: Friedemann Kleint <1b9f2592239daaec4856ccc1cfb4d2d55b35fb71@nokia.com>

bakaiadam/collaborative_qt_creator,farseerri/git_code,ostash/qt-creator-i18n-uk,bakaiadam/collaborative_qt_creator,KDAB/KDAB-Creator,dmik/qt-creator-os2,kuba1/qtcreator,dmik/qt-creator-os2,maui-packages/qt-creator,AltarBeastiful/qt-creator,malikcjm/qtcreator,duythanhphan/qt-creator,syntheticpp/qt-creator,xianian/qt-creator,danimo/qt-creator,malikcjm/qtcreator,martyone/sailfish-qtcreator,Distrotech/qtcreator,xianian/qt-creator,maui-packages/qt-creator,KDAB/KDAB-Creator,kuba1/qtcreator,martyone/sailfish-qtcreator,bakaiadam/collaborative_qt_creator,duythanhphan/qt-creator,KDE/android-qt-creator,danimo/qt-creator,AltarBeastiful/qt-creator,duythanhphan/qt-creator,richardmg/qtcreator,colede/qtcreator,farseerri/git_code,jonnor/qt-creator,jonnor/qt-creator,colede/qtcreator,KDE/android-qt-creator,amyvmiwei/qt-creator,KDE/android-qt-creator,Distrotech/qtcreator,omniacreator/qtcreator,omniacreator/qtcreator,martyone/sailfish-qtcreator,jonnor/qt-creator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,darksylinc/qt-creator,danimo/qt-creator,richardmg/qtcreator,omniacreator/qtcreator,azat/qtcreator,omniacreator/qtcreator,danimo/qt-creator,malikcjm/qtcreator,kuba1/qtcreator,maui-packages/qt-creator,azat/qtcreator,kuba1/qtcreator,xianian/qt-creator,maui-packages/qt-creator,martyone/sailfish-qtcreator,richardmg/qtcreator,richardmg/qtcreator,amyvmiwei/qt-creator,omniacreator/qtcreator,darksylinc/qt-creator,malikcjm/qtcreator,dmik/qt-creator-os2,kuba1/qtcreator,colede/qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,amyvmiwei/qt-creator,farseerri/git_code,farseerri/git_code,darksylinc/qt-creator,amyvmiwei/qt-creator,KDAB/KDAB-Creator,ostash/qt-creator-i18n-uk,maui-packages/qt-creator,danimo/qt-creator,hdweiss/qt-creator-visualizer,Distrotech/qtcreator,xianian/qt-creator,darksylinc/qt-creator,martyone/sailfish-qtcreator,richardmg/qtcreator,ostash/qt-creator-i18n-uk,kuba1/qtcreator,richardmg/qtcreator,duythanhphan/qt-creator,duythanhphan/qt-creator,colede/qtcreator,farseerri/git_code,duythanhphan/qt-creator,AltarBeastiful/qt-creator,maui-packages/qt-creator,martyone/sailfish-qtcreator,farseerri/git_code,omniacreator/qtcreator,bakaiadam/collaborative_qt_creator,ostash/qt-creator-i18n-uk,syntheticpp/qt-creator,syntheticpp/qt-creator,ostash/qt-creator-i18n-uk,bakaiadam/collaborative_qt_creator,kuba1/qtcreator,malikcjm/qtcreator,hdweiss/qt-creator-visualizer,duythanhphan/qt-creator,ostash/qt-creator-i18n-uk,xianian/qt-creator,azat/qtcreator,azat/qtcreator,danimo/qt-creator,KDE/android-qt-creator,omniacreator/qtcreator,xianian/qt-creator,bakaiadam/collaborative_qt_creator,darksylinc/qt-creator,syntheticpp/qt-creator,hdweiss/qt-creator-visualizer,hdweiss/qt-creator-visualizer,amyvmiwei/qt-creator,maui-packages/qt-creator,azat/qtcreator,jonnor/qt-creator,syntheticpp/qt-creator,colede/qtcreator,AltarBeastiful/qt-creator,KDE/android-qt-creator,darksylinc/qt-creator,colede/qtcreator,hdweiss/qt-creator-visualizer,KDE/android-qt-creator,kuba1/qtcreator,richardmg/qtcreator,martyone/sailfish-qtcreator,dmik/qt-creator-os2,darksylinc/qt-creator,jonnor/qt-creator,malikcjm/qtcreator,amyvmiwei/qt-creator,jonnor/qt-creator,KDE/android-qt-creator,Distrotech/qtcreator,martyone/sailfish-qtcreator,darksylinc/qt-creator,ostash/qt-creator-i18n-uk,kuba1/qtcreator,danimo/qt-creator,danimo/qt-creator,danimo/qt-creator,dmik/qt-creator-os2,amyvmiwei/qt-creator,dmik/qt-creator-os2,azat/qtcreator,hdweiss/qt-creator-visualizer,syntheticpp/qt-creator,Distrotech/qtcreator,malikcjm/qtcreator,farseerri/git_code,dmik/qt-creator-os2,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,KDE/android-qt-creator,KDAB/KDAB-Creator,xianian/qt-creator,Distrotech/qtcreator,amyvmiwei/qt-creator,bakaiadam/collaborative_qt_creator,farseerri/git_code,KDAB/KDAB-Creator,Distrotech/qtcreator,KDAB/KDAB-Creator,syntheticpp/qt-creator,colede/qtcreator,xianian/qt-creator