Add a MainWindow to have mouse and keyboard passed to MPV

CMakeLists.txt

src/module/module_qt_window.h

src/module/qt_window/mainwindow.cpp

src/module/qt_window/mainwindow.hh

src/module/qt_window/mpvwidget.cpp

src/module/qt_window/mpvwidget.hh

src/module/qt_window/mpvwidget_interface.cpp