first working progress bar

src/core/project.cpp

src/core/project.h

src/files/xpipfile.cpp

src/files/xpipfile.h

src/gui/waiting_message_dialog/waitingmessagedialog.cpp

src/gui/workerthread.cpp

src/input/xpipsaxhandler.cpp

src/input/xpipsaxhandler.h

src/utils/workmonitor.cpp

src/utils/workmonitor.h