Create qmake project
Replace QTCREATOR_UTILS_EXPORT by QTMANHATTANSTYLESHARED_EXPORT
Fix stylehelper.h include path
Fix coreconstants.h include path
Fix qtcassert.h include path
Fix fancymainwindow.h include path
Fix styledbar.h include path
Remove unnecessary dependency to coreplugin/icore.h and coreplugin/imode.h
Add missing doubletabwidget.ui file
Replace CORE_EXPORT by QTMANHATTANSTYLESHARED_EXPORT (The project compile now)
Remove unused core_global.h file