Improve save/restore of buildsteps
Improve save/restore of buildsteps

 * Inspect the BuildStep::Type enum for key names in fromMap/toMap

Reviewed-by: dt

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