Merge branch 'RecentFiles'

CMakeLists.txt

GUI/coregui/mainwindow/actionmanager.cpp

GUI/coregui/mainwindow/actionmanager.h

GUI/coregui/mainwindow/mainwindow.cpp

GUI/coregui/mainwindow/mainwindow.h

GUI/coregui/mainwindow/mainwindow_constants.h

GUI/coregui/mainwindow/newprojectdialog.cpp

GUI/coregui/mainwindow/projectdocument.h

GUI/coregui/mainwindow/projectmanager.cpp

GUI/coregui/mainwindow/projectmanager.h

GUI/coregui/utils/stringutils.cpp

GUI/coregui/utils/stringutils.h