QT add hotkey ( which is not shortcuts for a single window), support all platforms

QxtGlobalShortcut-master
QxtGlobalShortcut-master\.gitignore
QxtGlobalShortcut-master\COPYING
QxtGlobalShortcut-master\QxtGlobalShortcut.pri
QxtGlobalShortcut-master\README.md
QxtGlobalShortcut-master\cpl1.0.txt
QxtGlobalShortcut-master\example
QxtGlobalShortcut-master\example\demo
QxtGlobalShortcut-master\example\demo\Widget.cpp
QxtGlobalShortcut-master\example\demo\Widget.h
QxtGlobalShortcut-master\example\demo\demo.pro
QxtGlobalShortcut-master\example\demo\main.cpp
QxtGlobalShortcut-master\lgpl-2.1.txt
QxtGlobalShortcut-master\src
QxtGlobalShortcut-master\src\core
QxtGlobalShortcut-master\src\core\qxtglobal.cpp
QxtGlobalShortcut-master\src\core\qxtglobal.h
QxtGlobalShortcut-master\src\widgets
QxtGlobalShortcut-master\src\widgets\mac
QxtGlobalShortcut-master\src\widgets\mac\qxtglobalshortcut_mac.cpp
QxtGlobalShortcut-master\src\widgets\qxtglobalshortcut.cpp
QxtGlobalShortcut-master\src\widgets\qxtglobalshortcut.h
QxtGlobalShortcut-master\src\widgets\qxtglobalshortcut_p.h
QxtGlobalShortcut-master\src\widgets\win
QxtGlobalShortcut-master\src\widgets\win\qxtglobalshortcut_win.cpp
QxtGlobalShortcut-master\src\widgets\x11
QxtGlobalShortcut-master\src\widgets\x11\qxtglobalshortcut_x11.cpp

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